Triangular sequence T(n, m) = (p^(n-m)*q^m + p^m*q^(n-m))*A(n+1, m+1), where A(n, m) = (3*n -3*k +1)A(n-1, k-1) + (3*k-2)A(n-1, k), A(n,1)=A(n,n)=1, p=2 and q=3.
A154698
Triangular sequence T(n, m) = (p^(n-m)*q^m + p^m*q^(n-m))*A(n+1, m+1), where A(n, m) = (3*n -3*k +1)A(n-1, k-1) + (3*k-2)A(n-1, k), A(n,1)=A(n,n)=1, p=2 and q=3.
Terms
- a(0) =2a(1) =5a(2) =5a(3) =13a(4) =96a(5) =13a(6) =35a(7) =1170a(8) =1170a(9) =35a(10) =97a(11) =12948a(12) =39312a(13) =12948a(14) =97a(15) =275a(16) =142170a(17) =986760a(18) =986760a(19) =142170a(20) =275a(21) =793a(22) =1585368a(23) =22077900a(24) =47364480a(25) =22077900a(26) =1585368a(27) =793a(28) =2315a(29) =18009750
External references
- oeis: A154698