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

Terms

a(0) =0a(1) =2a(2) =6a(3) =32a(4) =60a(5) =162a(6) =252a(7) =512a(8) =720a(9) =1250a(10) =1650a(11) =2592a(12) =3276a(13) =4802a(14) =5880a(15) =8192a(16) =9792a(17) =13122a(18) =15390a(19) =20000a(20) =23100a(21) =29282a(22) =33396a(23) =41472a(24) =46800a(25) =57122a(26) =63882a(27) =76832a(28) =85260a(29) =101250