A176963 a(n) = (10*4^n - 3*(-4)^n - 22)/30.

1, 3, 27, 59, 443, 955, 7099, 15291, 113595, 244667, 1817531, 3914683, 29080507, 62634939, 465288123, 1002159035, 7444609979, 16034544571, 119113759675, 256552713147, 1905820154811, 4104843410363, 30493122476987, 65677494565819

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Index entries for linear recurrences with constant coefficients, signature (1,16,-16).

Formula

G.f.: x*(1+2*x+8*x^2) / ( (x-1)*(4*x-1)*(4*x+1) ). - R. J. Mathar, Apr 30 2010

Maple

seq( (10*4^n-3*(-4)^n-22)/30, n=1..10) ; # R. J. Mathar, Oct 11 2011

Crossrefs

Sequence in context: A025414 A201276 A053360 * A204046 A305094 A120117

Adjacent sequences: A176960 A176961 A176962 * A176964 A176965 A176966

Keyword

nonn,easy

Author

Roger L. Bagula, Apr 29 2010

Status

approved