Constant term in the expansion of (1 + x^4 + y^4 + z^4 + 1/(x*y*z))^n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =211a(8) =1681a(9) =7561a(10) =25201a(11) =69301a(12) =166321a(13) =360361a(14) =990991a(15) =5405401a(16) =34834801a(17) =187867681a(18) =833709241a(19) =3153281041a(20) =10491944401a(21) =31945216801a(22) =97323704941a(23) =345845431471