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%I #15 Apr 06 2024 05:43:38
%S 7,7,56,56,448,448,3584,3584,28672,28672,229376,229376,1835008,
%T 1835008,14680064,14680064,117440512,117440512,939524096,939524096,
%U 7516192768,7516192768,60129542144,60129542144,481036337152,481036337152,3848290697216,3848290697216
%N Number of palindromes of length n (in base 8).
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,8).
%F a(n) = 7*8^floor((n-1)/2).
%F a(n) = 8*a(n-2). G.f.: 7*x*(1+x)/(1-8*x^2). [_Colin Barker_, Jun 30 2012]
%t LinearRecurrence[{0,8},{7,7},30] (* _Harvey P. Dale_, Apr 09 2021 *)
%Y Cf. A050683.
%K nonn,base,easy
%O 1,1
%A _Martin Renner_, May 02 2006
%E More terms from _Colin Barker_, Jun 30 2012