Triangle, read by rows, where the g.f. of row n, R_n(x), is a polynomial of degree n that satisfies: [x^k] R_{n+1}(x) = [x^k] (1 + x*R_n(x))^(n+1) for k=0..n+1, with R_0(x) = 1.
A108990
Triangle, read by rows, where the g.f. of row n, R_n(x), is a polynomial of degree n that satisfies: [x^k] R_{n+1}(x) = [x^k] (1 + x*R_n(x))^(n+1) for k=0..n+1, with R_0(x) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =1a(7) =3a(8) =9a(9) =22a(10) =1a(11) =4a(12) =18a(13) =76a(14) =287a(15) =1a(16) =5a(17) =30a(18) =180a(19) =1025a(20) =5496a(21) =1a(22) =6a(23) =45a(24) =350a(25) =2670a(26) =19656a(27) =139727a(28) =1a(29) =7
External references
- oeis: A108990