997490844domain: NAppears in sequencesa(n) = T(3n+1,n), where T = Catalan triangle (A008315).at n=12A026004Number of North-East lattice paths from (0,0) to (n,n) that cross the diagonal y = x horizontally exactly three times.at n=12A268446Number of Young tableaux of shape [n, floor(n/2)].at n=25A368567