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 A171495 a(n) = 3*a(n-1)+4 for n > 0; a(0) = 6. 2
 6, 22, 70, 214, 646, 1942, 5830, 17494, 52486, 157462, 472390, 1417174, 4251526, 12754582, 38263750, 114791254, 344373766, 1033121302, 3099363910, 9298091734, 27894275206, 83682825622, 251048476870, 753145430614, 2259436291846 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Binomial transform of A171494; second binomial transform of A010726. Inverse binomial transform of A171496. LINKS FORMULA a(n) = 2*(4*3^n-1). G.f.: 2*(3-x)/((1-x)*(1-3*x)). MATHEMATICA NestList[3#+4&, 6, 30] (* Harvey P. Dale, Aug 25 2019 *) PROG (PARI) {m=25; v=concat([6], vector(m-1)); for(n=2, m, v[n]=3*v[n-1]+4); v} CROSSREFS Equals 2*A171498. Cf. A010726 (repeat 6, 10), A171494, A171496. Sequence in context: A271389 A247168 A305032 * A178706 A276779 A159555 Adjacent sequences:  A171492 A171493 A171494 * A171496 A171497 A171498 KEYWORD nonn AUTHOR Klaus Brockhaus, Dec 10 2009 STATUS approved

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Last modified June 23 07:38 EDT 2021. Contains 345395 sequences. (Running on oeis4.)