A037688 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,0,3.

1, 6, 24, 99, 397, 1590, 6360, 25443, 101773, 407094, 1628376, 6513507, 26054029, 104216118, 416864472, 1667457891, 6669831565, 26679326262, 106717305048, 426869220195, 1707476880781, 6829907523126, 27319630092504

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