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(x) = x + 3.
A257180
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(x) = x + 3.
Terms
- a(0) =1a(1) =3a(2) =3a(3) =9a(4) =24a(5) =9a(6) =27a(7) =141a(8) =141a(9) =27a(10) =81a(11) =726a(12) =1410a(13) =726a(14) =81a(15) =243a(16) =3471a(17) =11406a(18) =11406a(19) =3471a(20) =243a(21) =729a(22) =15828a(23) =81327a(24) =136872a(25) =81327a(26) =15828a(27) =729a(28) =2187a(29) =69873
External references
- oeis: A257180