A274074 - OEIS

A274074

a(n) = 6^n+(-1)^n.

2, 5, 37, 215, 1297, 7775, 46657, 279935, 1679617, 10077695, 60466177, 362797055, 2176782337, 13060694015, 78364164097, 470184984575, 2821109907457, 16926659444735, 101559956668417, 609359740010495, 3656158440062977, 21936950640377855, 131621703842267137

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OFFSET

0,1

LINKS

Table of n, a(n) for n=0..22.

Index entries for linear recurrences with constant coefficients, signature (5,6).

FORMULA

O.g.f.: (2-5*x) / ((1+x)*(1-6*x)).

E.g.f.: exp(-x) + exp(6*x).

a(n) = 5*a(n-1)+6*a(n-2) for n>1.

MATHEMATICA

Array[6^# + (-1)^# &, 23, 0] (* or *)