OFFSET
1,2
FORMULA
a(n) = A054474(n)/4.
MAPLE
b:= proc(n) b(n):= binomial(2*n, n)^2 end:
a:= proc(n) option remember;
b(n)/4-add(a(n-i)*b(i), i=1..n-1)
end:
seq(a(n), n=1..21); # Alois P. Heinz, Dec 05 2023
CROSSREFS
KEYWORD
nonn,walk
AUTHOR
Hugo Pfoertner, Dec 05 2023
STATUS
approved