102108domain: NAppears in sequencesa(n) = a(n-1) + Sum_{k=1..floor(n/4)} a(n-4k), with a(0)=1.at n=34A113439Third row of A113439.at n=8A113442Triangle read by columns: number of n-node (unlabeled) graphs with girth k, for n >= 3, k >= 3.at n=37A128041Number of n-node (unlabeled) graphs with girth 4.at n=8A128237