0,2

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

Index entries for linear recurrences with constant coefficients, signature (21, -143, 315) conjectured.

Conjecture: a(n) = 9^n/2+3*7^n/2-2*5^n. a(n)= +21*a(n-1) -143*a(n-2) +315*a(n-3). G.f.: x*(-5+41*x)/((9*x-1)*(7*x-1)*(5*x-1)). [R. J. Mathar, May 24 2010]

Sequence in context: A193184 A180787 A222455 * A054937 A302993 A266095

Adjacent sequences: A178292 A178293 A178294 * A178296 A178297 A178298

nonn

R. H. Hardin, suggested by R. J. Mathar in the Sequence Fans Mailing List, May 24 2010

approved