A099931 a(n) = Pell(n)*Pell(n-1)*Pell(n-2)*Pell(n-3) / 120.

1, 29, 1015, 34307, 1166438, 39618670, 1345902818, 45720876202, 1553165059215, 52761884311059, 1792350941301921, 60887169888069525, 2068371426604585180, 70263741326790571820, 2386898833730186862100

Offset

4,2

Links

Table of n, a(n) for n=4..18.

Index entries for linear recurrences with constant coefficients, signature (29,174,-174,-29,1).

Formula

G.f.: x^4 / ((1-x)*(1+6x+x^2)*(1-34x+x^2)).

a(n) = 29*a(n-1) + 174*a(n-2) - 174*a(n-3) - 29*a(n-4) + a(n-5). - Klaus Purath, Oct 17 2020

Crossrefs

Cf. A000129. Fourth column of triangle A099927.

Sequence in context: A218193 A218369 A234602 * A218635 A218239 A132058

Adjacent sequences: A099928 A099929 A099930 * A099932 A099933 A099934

Keyword

nonn,easy

Author

Ralf Stephan, Nov 03 2004

Status

approved