Triangle defined by g.f. A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n*k, k^2) * y^k ), as read by rows.
A228904
Triangle defined by g.f. A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n*k, k^2) * y^k ), as read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =3a(8) =7a(9) =1a(10) =1a(11) =4a(12) =26a(13) =62a(14) =1a(15) =1a(16) =5a(17) =70a(18) =1087a(19) =1031a(20) =1a(21) =1a(22) =6a(23) =155a(24) =9257a(25) =124702a(26) =24782a(27) =1a(28) =1a(29) =7
External references
- oeis: A228904