a(n) = (15*n)!*(n/2)!/((15*n/2)!*(5*n)!*(3*n)!).A276100a(n) = (15*n)!*(n/2)!/((15*n/2)!*(5*n)!*(3*n)!).Terms a(0) =1a(1) =114688a(2) =77636318760External referencesoeis: A276100