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A152438 a(n)=(19^n - 1)/(9*2^(3 - 2*Mod[n, 2])). 0
0, 1, 5, 381, 1810, 137561, 653415, 49659541, 235882820, 17927094321, 85153698025, 6471681049901, 30740484987030, 2336276859014281, 11097315080317835, 843395946104155461, 4006130743994738440 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..16.

MATHEMATICA

a[n_] :=(19^n - 1)/(9*2^(3 - 2*Mod[n, 2]));

Table[a[n], {n, 0, 30}]

CROSSREFS

Sequence in context: A206386 A198902 A100474 * A060506 A302394 A057633

Adjacent sequences:  A152435 A152436 A152437 * A152439 A152440 A152441

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Dec 04 2008

STATUS

approved

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Last modified October 20 10:43 EDT 2021. Contains 348100 sequences. (Running on oeis4.)