Triangle T(n, k) = binomial(n, k) + binomial(k*(n-k), n) + 2*(-1)^n*StirlingS1(n, k)*StirlingS1(n, n-k), read by rows.

A155826

Triangle T(n, k) = binomial(n, k) + binomial(k*(n-k), n) + 2*(-1)^n*StirlingS1(n, k)*StirlingS1(n, n-k), read by rows.

Terms

    a(0) =4a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =15a(8) =15a(9) =1a(10) =1a(11) =76a(12) =249a(13) =76a(14) =1a(15) =1a(16) =485a(17) =3516a(18) =3516a(19) =485a(20) =1a(21) =1a(22) =3606a(23) =46623a(24) =101354a(25) =46623a(26) =3606a(27) =1a(28) =1a(29) =30247

External references