A037537 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.

1, 6, 25, 101, 406, 1625, 6501, 26006, 104025, 416101, 1664406, 6657625, 26630501, 106522006, 426088025, 1704352101, 6817408406, 27269633625, 109078534501, 436314138006, 1745256552025, 6981026208101, 27924104832406

Offset

1,2

Links

Table of n, a(n) for n=1..23.

Index entries for linear recurrences with constant coefficients, signature (4,0,1,-4).

Formula

G.f.: x*(1+x)^2 / ( (x-1)*(4*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 29 2015

Crossrefs

Sequence in context: A327504 A346390 A323824 * A253220 A037481 A199844

Adjacent sequences: A037534 A037535 A037536 * A037538 A037539 A037540

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved