Triangle, read by rows, T(n,k) = t(n-k, k) where t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1) and f(n) = 2*n + 3.
A257611
Triangle, read by rows, T(n,k) = t(n-k, k) where t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1) and f(n) = 2*n + 3.
Terms
- a(0) =1a(1) =3a(2) =3a(3) =9a(4) =30a(5) =9a(6) =27a(7) =213a(8) =213a(9) =27a(10) =81a(11) =1308a(12) =2982a(13) =1308a(14) =81a(15) =243a(16) =7431a(17) =32646a(18) =32646a(19) =7431a(20) =243a(21) =729a(22) =40314a(23) =310263a(24) =587628a(25) =310263a(26) =40314a(27) =729a(28) =2187a(29) =212505
External references
- oeis: A257611