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A171495
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a(n) = 3*a(n-1)+4 for n > 0; a(0) = 6.
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2
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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
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OFFSET
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0,1
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COMMENTS
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Inverse binomial transform of A171496.
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LINKS
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FORMULA
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a(n) = 2*(4*3^n-1).
G.f.: 2*(3-x)/((1-x)*(1-3*x)).
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MATHEMATICA
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PROG
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(PARI) {m=25; v=concat([6], vector(m-1)); for(n=2, m, v[n]=3*v[n-1]+4); v}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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