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 A037688 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,0,3. 0
 1, 6, 24, 99, 397, 1590, 6360, 25443, 101773, 407094, 1628376, 6513507, 26054029, 104216118, 416864472, 1667457891, 6669831565, 26679326262, 106717305048, 426869220195, 1707476880781, 6829907523126, 27319630092504 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..23. Index entries for linear recurrences with constant coefficients, signature (4,0,0,1,-4). FORMULA G.f.: ( x*(1+2*x+3*x^3) ) / ( (x-1)*(4*x-1)*(1+x)*(x^2+1) ). - R. J. Mathar, Oct 11 2015 MATHEMATICA Table[FromDigits[PadRight[{}, n, {1, 2, 0, 3}], 4], {n, 30}] (* Harvey P. Dale, Mar 06 2024 *) CROSSREFS Sequence in context: A037505 A048179 A117614 * A343116 A360036 A255471 Adjacent sequences: A037685 A037686 A037687 * A037689 A037690 A037691 KEYWORD nonn,base,easy AUTHOR Clark Kimberling STATUS approved

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Last modified July 15 11:27 EDT 2024. Contains 374332 sequences. (Running on oeis4.)