Triangle read by rows, Ward numbers T(n, k) = Sum_{m=0..k} (-1)^(m + k) * binomial(n + k, n + m) * Stirling2(n + m, m), for n >= 0, 0 <= k <= n.
A269939
Triangle read by rows, Ward numbers T(n, k) = Sum_{m=0..k} (-1)^(m + k) * binomial(n + k, n + m) * Stirling2(n + m, m), for n >= 0, 0 <= k <= n.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =3a(6) =0a(7) =1a(8) =10a(9) =15a(10) =0a(11) =1a(12) =25a(13) =105a(14) =105a(15) =0a(16) =1a(17) =56a(18) =490a(19) =1260a(20) =945a(21) =0a(22) =1a(23) =119a(24) =1918a(25) =9450a(26) =17325a(27) =10395a(28) =0a(29) =1
External references
- oeis: A269939