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A152438
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a(n)=(19^n - 1)/(9*2^(3 - 2*Mod[n, 2])).
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0
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0, 1, 5, 381, 1810, 137561, 653415, 49659541, 235882820, 17927094321, 85153698025, 6471681049901, 30740484987030, 2336276859014281, 11097315080317835, 843395946104155461, 4006130743994738440
(list; graph; refs; listen; history; internal format)
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