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Search: id:A126159
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| 1, 12, 624, 72768, 15073536, 4879690752, 2275446779904, 1444596033404928, 1198103353905709056, 1257795823373397000192, 1630379271356490615619584, 2557344389023281412086693888, 4774145871907749099664809394176
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OFFSET
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0,2
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FORMULA
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a(n)=4^n*Sum_[k, 0<=k<=n}2^(n-k)*3^k*A088874(n,k) . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 21 2006
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EXAMPLE
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a(1) = 1*(1) + 2*(5) + 1*(1) = 12;
a(2) = 1*(7) + 4*(35) + 6*(55) + 4*(35) + 1*(7) = 624;
a(3) = 1*(139) + 6*(695) + 15*(1195) + 20*(1415) + 15*(1195) + 6*(695) + 1*(139) = 72768.
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CROSSREFS
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Cf. A126155.
Sequence in context: A042111 A159644 A013587 this_sequence A071307 A060612 A002196
Adjacent sequences: A126156 A126157 A126158 this_sequence A126160 A126161 A126162
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Dec 20 2006
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