T(n, k) = binomial(n, k)*sf(n-k)*sf(k) where sf is the subfactorial (A000166). Triangle read by rows, for 0 <= k <= n.

A337615

T(n, k) = binomial(n, k)*sf(n-k)*sf(k) where sf is the subfactorial (A000166). Triangle read by rows, for 0 <= k <= n.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =1a(4) =0a(5) =1a(6) =2a(7) =0a(8) =0a(9) =2a(10) =9a(11) =0a(12) =6a(13) =0a(14) =9a(15) =44a(16) =0a(17) =20a(18) =20a(19) =0a(20) =44a(21) =265a(22) =0a(23) =135a(24) =80a(25) =135a(26) =0a(27) =265a(28) =1854a(29) =0

External references