A355492 - OEIS

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A355492

a(n) = 7*3^n - 2.

5, 19, 61, 187, 565, 1699, 5101, 15307, 45925, 137779, 413341, 1240027, 3720085, 11160259, 33480781, 100442347, 301327045, 903981139, 2711943421, 8135830267, 24407490805, 73222472419, 219667417261, 659002251787, 1977006755365, 5931020266099, 17793060798301, 53379182394907

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OFFSET

0,1

COMMENTS

Right ending points of the gaps in A171884. The left ending points are given in A198643.

LINKS

Jianing Song, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (4,-3).

FORMULA

G.f.: (5-x)/((1-x)*(1-3*x)).

E.g.f.: 7*exp(3*x) - 2*exp(x).

EXAMPLE