A067403 - OEIS

A067403

Third column of triangle A067402.

1, 5, 45, 405, 3645, 32805, 295245, 2657205, 23914845, 215233605, 1937102445, 17433922005, 156905298045, 1412147682405, 12709329141645, 114383962274805, 1029455660473245, 9265100944259205, 83385908498332845, 750473176484995605, 6754258588364960445, 60788327295284644005

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

Index entries for linear recurrences with constant coefficients, signature (9).

FORMULA

a(n) = A067402(n+2, 2).

a(n) = 5*9^(n-1) for n>=1, a(0) = 1.

G.f.: (1-4*x)/(1-9*x).

E.g.f.: (4 + 5*exp(9*x))/9. - Stefano Spezia, Sep 30 2022

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