6928350domain: NAppears in sequencesa(n) = (2n+4)!/(4!*n!*(n+1)!).at n=8A002803Four-column table read by rows: Quadruples that have the same value of phi, sigma, and tau.at n=27A322680Four-column table read by rows: Primitive distinct quadruples that have the same value of phi, sigma, and tau.at n=27A322690