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A188526 a(n) = 3^(2*n + 3) + 2^n. 2
28, 245, 2191, 19691, 177163, 1594355, 14348971, 129140291, 1162261723, 10460353715, 94143179851, 847288611491, 7625597489083, 68630377373075, 617673396300331, 5559060566588291, 50031545099065243, 450283905891128435, 4052555153019238411 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

All terms are multiples of 7: A082784(a(n)) = 1, A188527(n) = a(n)/7.

REFERENCES

Kees Doets and Jan van Eijck, The Haskell Road to Logic, Maths and Programming, The King's College Publications, London 2006. Cf. exercise 7.9, p 239.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..500

FORMULA

a(n) = A013708(n+1) + A000079(n).

G.f.: 7*(4-9*x)/((1-2*x)*(1-9*x))  - Bruno Berselli, Jul 17 2011

MATHEMATICA

Table[3^(2n+3)+2^n, {n, 0, 20}]  (* Harvey P. Dale, Apr 09 2011 *)

PROG

(MAGMA) [3^(2*n + 3) + 2^n: n in [0..20]]; // Vincenzo Librandi, Jul 17 2011

CROSSREFS

Sequence in context: A119544 A112797 A085438 * A219600 A092341 A042522

Adjacent sequences:  A188523 A188524 A188525 * A188527 A188528 A188529

KEYWORD

nonn,easy

AUTHOR

Reinhard Zumkeller, Apr 03 2011

STATUS

approved

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Last modified September 26 16:15 EDT 2021. Contains 347670 sequences. (Running on oeis4.)