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

3,1

Links

Table of n, a(n) for n=3..32.

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)

Crossrefs

Cf. A027477.

Sequence in context: A171342 A112747 A201831 * A201211 A194783 A254870

Adjacent sequences: A027478 A027479 A027480 * A027482 A027483 A027484

Keyword

nonn,easy

Author

Olivier Gérard

Extensions

More terms from Sean A. Irvine, Nov 06 2019

Status

approved