Triangle defined by g.f. A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, (n-k)*k) * y^k ), as read by rows.

A228900

Triangle defined by g.f. A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, (n-k)*k) * y^k ), as read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =15a(8) =15a(9) =1a(10) =1a(11) =155a(12) =484a(13) =155a(14) =1a(15) =1a(16) =2685a(17) =36068a(18) =36068a(19) =2685a(20) =1a(21) =1a(22) =65517a(23) =5082340a(24) =15763254a(25) =5082340a(26) =65517a(27) =1a(28) =1a(29) =2063205

External references