Least k such that n! + k^2 + k is a perfect square.

Terms

a(0) =0a(1) =0a(2) =1a(3) =5a(4) =3a(5) =119a(6) =719a(7) =260a(8) =180a(9) =495a(10) =3628799a(11) =39916799a(12) =6561647a(13) =9899a(14) =722799a(15) =15308432a(16) =735092a(17) =779904000a(18) =1193692724a(19) =77841862127a(21) =7981643124a(22) =231453720692