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A117866 Number of palindromes (in base 7) below 7^n. 0
6, 12, 54, 96, 390, 684, 2742, 4800, 19206, 33612 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = 8*7^((n-1)/2)-2 (n odd), 2*7^(n/2)-2 (n even).

CROSSREFS

Cf. A050250.

Sequence in context: A106692 A032470 A018809 * A094060 A076722 A076305

Adjacent sequences:  A117863 A117864 A117865 * A117867 A117868 A117869

KEYWORD

nonn,base

AUTHOR

Martin Renner (martin.renner(AT)gmx.net), May 02 2006

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Last modified February 16 19:18 EST 2012. Contains 205945 sequences.