Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w<x+y.

Terms

a(0) =0a(1) =3a(2) =11a(3) =28a(4) =56a(5) =99a(6) =159a(7) =240a(8) =344a(9) =475a(10) =635a(11) =828a(12) =1056a(13) =1323a(14) =1631a(15) =1984a(16) =2384a(17) =2835a(18) =3339a(19) =3900a(20) =4520a(21) =5203a(22) =5951a(23) =6768a(24) =7656a(25) =8619a(26) =9659a(27) =10780a(28) =11984a(29) =13275