OFFSET
2,2
COMMENTS
Also T(2*n-2,n-2), array T as in A055807.
FORMULA
a(n) = Sum_{s=1..n} binomial(n,s)*binomial(s+n-4,n-3) = n*hypergeom([-n + 1, n-2], [2], -1) for n >= 3. - Petros Hadjicostas, Feb 13 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved