0,2

Table of n, a(n) for n=0..9.

Index entries for linear recurrences with constant coefficients, signature (2).

a(0) = 1, a(2) = 5, a(n) = 2^(n+2) for n>1.

G.f.: -(1+3*x+6*x^2)/(-1+2*x). - R. J. Mathar, Nov 14 2007

a(3) = 32 = sum of row 3 terms of triangle A132478: (4 + 9 + 18 + 1).

a(3) = 32 = 2^5.

Cf. A132478.

Sequence in context: A222535 A063076 A270805 * A045944 A038361 A227719

Adjacent sequences: A132476 A132477 A132478 * A132480 A132481 A132482

nonn

Gary W. Adamson, Aug 23 2007

approved