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

Terms

a(0) =0a(1) =4a(2) =18a(3) =64a(4) =150a(5) =324a(6) =588a(7) =1024a(8) =1620a(9) =2500a(10) =3630a(11) =5184a(12) =7098a(13) =9604a(14) =12600a(15) =16384a(16) =20808a(17) =26244a(18) =32490a(19) =40000a(20) =48510a(21) =58564a(22) =69828a(23) =82944a(24) =97500a(25) =114244a(26) =132678a(27) =153664a(28) =176610a(29) =202500