Triangle defined by g.f. A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k^2) * y^k ), as read by rows.
A228902
Triangle defined by g.f. A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k^2) * y^k ), as read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =6a(8) =45a(9) =1a(10) =1a(11) =10a(12) =505a(13) =2905a(14) =1a(15) =1a(16) =15a(17) =3045a(18) =412044a(19) =411500a(20) =1a(21) =1a(22) =21a(23) =12880a(24) =16106168a(25) =1218805926a(26) =100545716a(27) =1a(28) =1a(29) =28
External references
- oeis: A228902