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 A320469 a(n) = 3*a(n-1) + 10*a(n-2), n >= 2; a(0)=1, a(1)=1. 2
 1, 1, 13, 49, 277, 1321, 6733, 33409, 167557, 836761, 4185853, 20925169, 104634037, 523153801, 2615801773, 13078943329, 65394847717, 326973976441, 1634870406493, 8174350983889, 40871757016597, 204358780888681, 1021793912832013, 5108969547382849, 25544847770468677 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Index entries for linear recurrences with constant coefficients, signature (3,10). FORMULA a(n) = (4*(-2)^n + 3*5^n)/7. G.f.: (1-2*x)/((1-5*x)*(1+2*x)). PROG (PARI) {a(n) = (4*(-2)^n+3*5^n)/7} (PARI) N=40; x='x+O('x^N); Vec((1-2*x)/((1-5*x)*(1+2*x))) CROSSREFS Cf. A053428, A224473 (trimorphic number), A320468, A321133. Sequence in context: A147346 A147452 A146782 * A074014 A147481 A245138 Adjacent sequences:  A320466 A320467 A320468 * A320470 A320471 A320472 KEYWORD nonn,easy AUTHOR Seiichi Manyama, Aug 27 2019 STATUS approved

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)