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A156566 a(2n+2)=9*a(2n+1), a(2n+1)=9*a(2n)-8^n*A000108(n), a(0)=1 . 2
1, 8, 72, 640, 5760, 51712, 465408, 4186112, 37675008, 339017728, 3051159552, 27459059712, 247131537408, 2224149233664, 20017343102976, 180155188248576, 1621396694237184, 14592546256715776, 131332916310441984 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Hankel transform is 8^C(n+1,2).

LINKS

Table of n, a(n) for n=0..18.

FORMULA

a(n)=sum{k=0..n, A120730(n,k)*8^k}.

MATHEMATICA

a[0] = 1; a[1] = 8; a[2] = 72; a[n_] := a[n] = (-288*(n-2)*a[n-3] + 32*(n-2)*a[n-2] + 9*(n+1)*a[n-1])/(n+1); Table[a[n], {n, 0, 18}] (* Jean-François Alcover, Nov 15 2016 *)

CROSSREFS

Cf. A000108, A156270, A001405, A151281, A151162, A151254, A156195, A156361, A156362

Sequence in context: A242160 A062541 A057091 * A055275 A155198 A147840

Adjacent sequences:  A156563 A156564 A156565 * A156567 A156568 A156569

KEYWORD

nonn

AUTHOR

Philippe Deléham, Feb 10 2009

STATUS

approved

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Last modified February 20 18:31 EST 2018. Contains 299381 sequences. (Running on oeis4.)