A triangular sequence recursion: A(n,k)=A(n - 1, k - 1) + A(n - 1, k) + (-12 + 5 n) (-9 + 5 n)*A(n - 2, k - 1).

A153878

A triangular sequence recursion: A(n,k)=A(n - 1, k - 1) + A(n - 1, k) + (-12 + 5 n) (-9 + 5 n)*A(n - 2, k - 1).

Terms

    a(0) =2a(1) =3a(2) =3a(3) =2a(4) =44a(5) =2a(6) =2a(7) =310a(8) =310a(9) =2a(10) =2a(11) =728a(12) =9772a(13) =728a(14) =2a(15) =2a(16) =1486a(17) =127680a(18) =127680a(19) =1486a(20) =2a(21) =2a(22) =2684a(23) =564510a(24) =6099016a(25) =564510a(26) =2684a(27) =2a(28) =2a(29) =4422

External references