A027481 Second subdiagonal of triangle A027477, constructed from the Stirling numbers of the first kind.
23, 215, 1035, 3535, 9730, 23058, 48930, 95370, 173745, 299585, 493493, 782145, 1199380, 1787380, 2597940, 3693828, 5150235, 7056315, 9516815, 12653795, 16608438, 21542950, 27642550, 35117550, 44205525, 55173573, 68320665, 83980085, 102521960, 124355880
Offset: 3
Crossrefs
Cf. A027477.
Formula
a(n) = A027477(n+2,n).
Conjectures from Chai Wah Wu, Apr 08 2021: (Start)
a(n) = 7*a(n-1) - 21*a(n-2) + 35*a(n-3) - 35*a(n-4) + 21*a(n-5) - 7*a(n-6) + a(n-7) for n > 9.
G.f.: x^3*(-13*x^2 - 54*x - 23)/(x - 1)^7. (End)
Extensions
More terms from Sean A. Irvine, Nov 06 2019