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A152258 a(n) = ((3^n - 1)*(3^n + 1))^2/2^(7 - (n mod 2)). 0
0, 1, 50, 8281, 336200, 54479161, 2206472450, 357449732641, 14476719552800, 2345228664408721, 94981761344401250, 15387045345638267401, 623175336533653521800, 100954404519087336988681, 4088653383025896747098450, 662361848050246745812972561 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..15.

FORMULA

a(n)=((3^n - 1)*(3^n + 1))^2/2^(7 - Mod[n, 2]).

a(n)=6643*a(n-2)-538083*a(n-4)+531441*a(n-6). - R. J. Mathar, Dec 04 2008

MATHEMATICA

Clear[a, n];

a[n_] := ((3^n - 1)*(3^n + 1))^2/2^(7 - Mod[n, 2])

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

CROSSREFS

Cf. A003462, A002452.

Sequence in context: A301992 A229753 A276102 * A203097 A028465 A252630

Adjacent sequences:  A152255 A152256 A152257 * A152259 A152260 A152261

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Dec 01 2008

STATUS

approved

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Last modified November 26 23:41 EST 2020. Contains 338670 sequences. (Running on oeis4.)