Third entry in row n of triangle in A169950.

Terms

a(0) =1a(1) =1a(2) =4a(3) =8a(4) =15a(5) =23a(6) =44a(7) =64a(8) =117a(9) =173a(10) =262a(11) =374a(12) =571a(13) =791a(14) =1188a(15) =1644a(16) =2355a(17) =3205a(18) =4552a(19) =5980a(20) =8283a(21) =10925a(22) =14702a(23) =19338a(24) =26031a(25) =33581a(26) =44690a(27) =57566a(28) =75531a(29) =96531