2015-04-22 18:33:54 +02:00
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def binomcoeff(n,k):
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nom = 1
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denum = 1
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for i in range(n-k):
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nom *= (n-i)
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denum *= (i+1)
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v = nom//denum
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return v
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2014-11-04 13:02:25 +01:00
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2015-04-22 18:33:54 +02:00
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def E(n,k):
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return binomcoeff(2*n+k,n)*binomcoeff(n+k,n)//2
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2014-11-04 13:02:25 +01:00
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2015-04-22 18:33:54 +02:00
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print(E(1,2), E(2,1), E(2,2), E(3,1))
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