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Table of n, a(n) for n=1..19.
Index entries for linear recurrences with constant coefficients, signature (7,0,1,-7).
G.f.: x*(1+x)^2 / ( (x-1)*(7*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015
Sequence in context: A000846 A231822 A049684 * A037484 A013566 A056769
Adjacent sequences: A037537 A037538 A037539 * A037541 A037542 A037543