Triangle read by rows: T(n,0)=1, T(n,n)=(-1)^floor(n/2), T(n+1,k)=T(n,k-1)+T(n,k) for 0 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 2, 2, 0, 1, 1, 3, 4, 2, 1, 1, 1, 4, 7, 6, 3, 0, 1, 1, 5, 11, 13
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