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Search: id:A156566
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| A156566 |
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a(2n+2)=9*a(2n+1), a(2n+1)=9*a(2n)-8^n*A000108(n), a(0)=1 . |
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3
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| 1, 8, 72, 640, 5760, 51712, 465408, 4186112, 37675008, 339017728, 3051159552, 27459059712, 247131537408, 2224149233664, 20017343102976, 180155188248576, 1621396694237184, 14592546256715776, 131332916310441984
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Hankel transform is 8^C(n+1,2).
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FORMULA
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a(n)=sum{k=0..n, A120730(n,k)*8^k}.
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CROSSREFS
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Cf. A000108, A156270, A001405, A151281, A151162, A151254, A156195, A156361, A156362
Sequence in context: A158798 A062541 A057091 this_sequence A055275 A155198 A147840
Adjacent sequences: A156563 A156564 A156565 this_sequence A156567 A156568 A156569
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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 10 2009
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