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 A164826 Sequences A087800 and A077416 interleaved. 0
 2, 1, 12, 13, 142, 155, 1692, 1847, 20162, 22009, 240252, 262261, 2862862, 3125123, 34114092, 37239215, 406506242, 443745457, 4843960812, 5287706269, 57721023502, 63008729771, 687808321212, 750817050983, 8195978831042 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Index entries for linear recurrences with constant coefficients, signature (0,12,0,-1). FORMULA a(n) = a(n-1)+a(n-2) for n even, a(n) = 10*a(n-1)+a(n-2) for n odd; with a(1) = 2, a(2) = 1. a(n) = 12*a(n-2)-a(n-4). G.f.: x*(x^3-12*x^2+x+2) / (x^4-12*x^2+1). [Colin Barker, Feb 18 2013] MATHEMATICA LinearRecurrence[{0, 12, 0, -1}, {2, 1, 12, 13}, 30] (* Harvey P. Dale, Oct 02 2017 *) CROSSREFS Cf. A087800, A077416, A000032, A162671. Sequence in context: A278330 A048854 A151508 * A055392 A045873 A265022 Adjacent sequences: A164823 A164824 A164825 * A164827 A164828 A164829 KEYWORD nonn,easy,less AUTHOR Mark Dols, Aug 27 2009 EXTENSIONS Better name by Paul Muljadi, Jan 13 2011 STATUS approved

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Last modified March 22 18:06 EDT 2023. Contains 361432 sequences. (Running on oeis4.)