Number of (w,x,y) with all terms in {0,...,n} and w<x+y and x<=y.

Terms

a(0) =0a(1) =3a(2) =11a(3) =27a(4) =53a(5) =92a(6) =146a(7) =218a(8) =310a(9) =425a(10) =565a(11) =733a(12) =931a(13) =1162a(14) =1428a(15) =1732a(16) =2076a(17) =2463a(18) =2895a(19) =3375a(20) =3905a(21) =4488a(22) =5126a(23) =5822a(24) =6578a(25) =7397a(26) =8281a(27) =9233a(28) =10255a(29) =11350