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

Terms

a(0) =0a(1) =2a(2) =3a(3) =32a(4) =40a(5) =162a(6) =189a(7) =512a(8) =576a(9) =1250a(10) =1375a(11) =2592a(12) =2808a(13) =4802a(14) =5145a(15) =8192a(16) =8704a(17) =13122a(18) =13851a(19) =20000a(20) =21000a(21) =29282a(22) =30613a(23) =41472a(24) =43200a(25) =57122a(26) =59319a(27) =76832a(28) =79576a(29) =101250