671980
domain: N
Appears in sequences
- Triangle read by rows: counts series-parallel networks by the number of series connections.at n=38A140945
- Triangle read by rows: counts series-parallel networks by the number of series connections.at n=42A140945
- Total number of nodes summed over all lattice paths from (0,0) to (n,n) that do not go above the diagonal x=y and consist of steps (h,v) with h, v prime or one.at n=12A308274