a(n) = hypergeom([n, -n, 1/2], [1, 1], -8).

A358388

a(n) = hypergeom([n, -n, 1/2], [1, 1], -8).

Terms

    a(0) =1a(1) =5a(2) =89a(3) =2069a(4) =53505a(5) =1467765a(6) =41817305a(7) =1223277221a(8) =36488826881

External references