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A167435 Hankel transform of A084076. 2
1, 2, -16, -3584, -1114112, -771751936, -68719476736, 50102545854496768, 4999067643975288487936, 1104958199127771065681444864, 363815722265501838229553819942912 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(n) = 2^(n^2)*(-1)^n*Sum_{k=0..n} C(n+k,2k)*(-2)^(n-k).
a(n) = 2^(n^2)*[x^n](1-2*x)/(1+3*x+4*x^2) = 2^(n^2) *A247560(n).
MATHEMATICA
a[n_] := Sum[Binomial[n + k, 2*k]*(-2)^(n - k), {k, 0, n}]; Table[2^(n^2)*(-1)^n*a[n], {n, 0, 10}] (* G. C. Greubel, Jun 13 2016 *)
CROSSREFS
Sequence in context: A338005 A203315 A158506 * A270124 A138834 A088321
KEYWORD
easy,sign
AUTHOR
Paul Barry, Nov 03 2009
STATUS
approved

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Last modified July 21 01:14 EDT 2024. Contains 374462 sequences. (Running on oeis4.)