OFFSET
0,3
LINKS
Z.-W. Sun, Congruences for Franel numbers, arXiv preprint arXiv:1112.1034, 2011.
MATHEMATICA
a172[n_] := Sum[Binomial[2k, n] Binomial[2k, k] Binomial[2(n-k), n-k], {k, 0, n}]/2^n;
a[n_] := Sum[(-1)^k k^2 a172[k], {k, 0, n-1}];
Table[a[n], {n, 0, 23}] (* Jean-François Alcover, Feb 12 2019 *)
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Feb 16 2012
STATUS
approved