Triangle defined by g.f.: A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n, k)^n * y^k ), as read by rows.
A209424
Triangle defined by g.f.: A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n, k)^n * y^k ), as read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =12a(8) =12a(9) =1a(10) =1a(11) =76a(12) =347a(13) =76a(14) =1a(15) =1a(16) =701a(17) =20429a(18) =20429a(19) =701a(20) =1a(21) =1a(22) =8477a(23) =1919660a(24) =10707908a(25) =1919660a(26) =8477a(27) =1a(28) =1a(29) =126126
External references
- oeis: A209424