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A145073
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Coefficient of x^(3^n) in Q(x)^(n+1), where Q(x) = Sum_{k>=0} (x^(3^k) + x^(2*3^k)).
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3
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1, 2, 7, 44, 325, 3110, 34258, 436304, 6246439, 99637730, 1747851787, 33469239848, 694321125511, 15513919320368, 371408549270425, 9484764686963792, 257355204923817028, 7393783957451330630, 224224270472995407877
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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PROG
| (PARI) { a(n) = local( Q = sum(j=0, n, x^(3^j)+x^(2*3^j)) + O(x^(3^n+1)) ); polcoeff(Q^(n+1), 3^n) }
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CROSSREFS
| Cf. A007178, A145074, A145075, A145076.
Sequence in context: A103084 A041507 A158107 * A111561 A000155 A077045
Adjacent sequences: A145070 A145071 A145072 * A145074 A145075 A145076
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Oct 09 2008
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EXTENSIONS
| a(10)-a(12) from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Apr 28 2009
a(13)-a(18) from Max Alekseyev (maxale(AT)gmail.com), Dec 18 2011
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