Number of (w,x,y,z) with all terms in {0,...,n}, w odd, x and y even.

Terms

a(0) =0a(1) =2a(2) =12a(3) =32a(4) =90a(5) =162a(6) =336a(7) =512a(8) =900a(9) =1250a(10) =1980a(11) =2592a(12) =3822a(13) =4802a(14) =6720a(15) =8192a(16) =11016a(17) =13122a(18) =17100a(19) =20000a(20) =25410a(21) =29282a(22) =36432a(23) =41472a(24) =50700a(25) =57122a(26) =68796a(27) =76832a(28) =91350a(29) =101250