References to A137276

Triangle T(n,k), read by rows: T(n,k)= 0 if n-k odd. T(n,k)= 2*(-1)^((n-k)/2)*(2k-n)/(n+k)*binomial((n+k)/2,(n-k)/2) if n-k even.
1, 0, 1, 2, 0, 1, 0, 1, 0, 1, 2, 0, 0, 0, 1, 0, 3, 0, 1, 0, 1, 2, 0, 3, 0, 2, 0, 1, 0, 5, 0

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