A054118 Subdiagonal T(n,n-3), array T as in A054115.

1, 24, 144, 864, 5904, 46224, 409104, 4037904, 43954704, 522956304, 6749977104, 93928268304, 1401602636304, 22324392524304, 378011820620304, 6780385526348304, 128425485935180304, 2561327494111820304, 53652269665821260304, 1177652997443428940304

Offset: 3

Author

Clark Kimberling

Keywords

• nonn

Formula

Conjecture: a(n) = (n+1)*a(n-1) - n*a(n-2) for n>=6. - R. J. Mathar, Jun 13 2013

Extensions

Offset changed to 3 by Georg Fischer, Jan 23 2022

More terms from Alois P. Heinz, Jan 24 2022