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

Terms

a(0) =0a(1) =1a(2) =8a(3) =16a(4) =54a(5) =81a(6) =192a(7) =256a(8) =500a(9) =625a(10) =1080a(11) =1296a(12) =2058a(13) =2401a(14) =3584a(15) =4096a(16) =5832a(17) =6561a(18) =9000a(19) =10000a(20) =13310a(21) =14641a(22) =19008a(23) =20736a(24) =26364a(25) =28561a(26) =35672a(27) =38416a(28) =47250a(29) =50625