A277132 The first subdiagonal of triangle A196842.

1, 3, 14, 78, 508, 3796, 32048, 301872, 3139680, 35746080, 442258560, 5909028480, 84802072320, 1301090515200, 21253339699200, 368281038182400, 6747621163315200, 130338926671564800, 2647326900234240000, 56404832240977920000

Offset: 1

Author

R. J. Mathar, Oct 01 2016

Keywords

• nonn
• easy

Crossrefs

Cf. A196842.

Formula

a(n) = A196842(n,n-1).

a(n) + (-2*n-1)*a(n-1) + n^2*a(n-2) = 0.