A037536 Base-3 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.

1, 5, 16, 49, 149, 448, 1345, 4037, 12112, 36337, 109013, 327040, 981121, 2943365, 8830096, 26490289, 79470869, 238412608, 715237825, 2145713477, 6437140432, 19311421297, 57934263893, 173802791680, 521408375041

Offset

1,2

Links

Table of n, a(n) for n=1..25.

Index entries for linear recurrences with constant coefficients, signature (3,0,1,-3).

Formula

G.f.: x*(1+x)^2 / ( (x-1)*(3*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 29 2015

Crossrefs

Sequence in context: A180129 A244410 A052909 * A192904 A082001 A084356

Adjacent sequences: A037533 A037534 A037535 * A037537 A037538 A037539

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved