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A145074
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Coefficient of x^(4^n) in Q(x)^(n+1) where Q(x) = Sum_{k>=0} (x^(4^k) + x^(2*4^k) + x^(3*4^k)).
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3
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1, 3, 12, 97, 885, 10386, 141295, 2218987, 39171564, 770029605, 16652860169, 393052609026, 10051000032099, 276818387211471, 8168772682637220, 257133140827399753
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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PROG
| (PARI) {a(n, q=4)=local(Q=sum(j=0, n, (x^(q^j)-x^(q*q^j))/(1-x^(q^j)+O(x^(q^n+1))))); polcoeff(Q^(n+1), q^n)}
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CROSSREFS
| Cf. A007178, A145073, A145075, A145076.
Sequence in context: A025503 A078124 A115245 * A162055 A067300 A133359
Adjacent sequences: A145071 A145072 A145073 * A145075 A145076 A145077
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KEYWORD
| more,nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Oct 09 2008
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EXTENSIONS
| a(8)-a(10) from Sean A. Irvine (sairvin(AT)xtra.co.nz), Mar 31 2011
a(11)-a(15) from Max Alekseyev (maxale(AT)gmail.com), Dec 19 2011
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