60621domain: NAppears in sequencesa(n) = Sum_{k=0..floor(n/5)} C(n-3*k,2*k) * 2^k.at n=24A098577Triangle T(n,k) = 1 -A002627(k) -A002627(n-k) +A002627(n), read by rows.at n=37A176305Triangle T(n,k) = 1 -A002627(k) -A002627(n-k) +A002627(n), read by rows.at n=43A176305First difference of A002627.at n=7A193657