OFFSET
0,4
FORMULA
a(2n) = A127769(n).
PROG
(PARI) a(n) = {n++; my(m = matrix(n+1, n+1, i, j, i--; j--; if ((i >= j) && (i <= 2*j), (i+1)/binomial(2*i, i), 0))); m = m^(-1); vecsum(m[n, ]); } \\ Michel Marcus, Sep 30 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Barry, Jan 28 2007
EXTENSIONS
More terms from Michel Marcus, Sep 30 2018
STATUS
approved