Number of unlabeled 3-element intersecting families (with distinct sets) of an n-element set.

Terms

a(0) =4a(1) =19a(2) =61a(3) =157a(4) =353a(5) =717a(6) =1355a(7) =2412a(8) =4094a(9) =6676a(10) =10524a(11) =16108a(12) =24036a(13) =35063a(14) =50135a(15) =70409a(16) =97295a(17) =132485a(18) =178011a(19) =236268a(20) =310086a(21) =402768a(22) =518158a(23) =660692a(24) =835486a(25) =1048379a(26) =1306039a(27) =1616025a(28) =1986887a(29) =2428245