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

Terms

a(0) =1a(1) =2a(2) =24a(3) =32a(4) =135a(5) =162a(6) =448a(7) =512a(8) =1125a(9) =1250a(10) =2376a(11) =2592a(12) =4459a(13) =4802a(14) =7680a(15) =8192a(16) =12393a(17) =13122a(18) =19000a(19) =20000a(20) =27951a(21) =29282a(22) =39744a(23) =41472a(24) =54925a(25) =57122a(26) =74088a(27) =76832a(28) =97875a(29) =101250