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Search: id:A126694
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| 1, 7, 56, 455, 3710, 30282, 247254, 2019087, 16488710, 134656130, 1099686056, 8980749862, 73342721956, 598965319960, 4891549246290, 39947649057855, 3262391226611830, 2664286127154330, 21758336553841440, 177693081299126610
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OFFSET
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0,2
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COMMENT
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The Hankel transform of this sequence is 7^n =[1, 7, 49, 343, 2401, ...] . The Hankel transform of the aerated sequence with g.f. 1/(1-7*x^2*c(x^2)) is also 7^n.
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FORMULA
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a(0)=1, a(n)=(49*a(n-1)-7*A000108(n-1))/6 for n>=1 . a(n)=Sum_{k, 0<=k<=n}A106566(n,k)*7^k . a(n)=Sum_{k, 0<=k<=n}A039599(n,k)*6^k.
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CROSSREFS
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Cf. A000108, A000984, A007854, A076035, A076036, A127628, A115970.
Sequence in context: A092318 A057090 A055274 this_sequence A024091 A082305 A001730
Adjacent sequences: A126691 A126692 A126693 this_sequence A126695 A126696 A126697
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Feb 14 2007
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