Regular triangle where T(n,k) is the number of labeled k-uniform hypergraphs spanning n vertices.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =41a(8) =11a(9) =1a(10) =1a(11) =768a(12) =958a(13) =26a(14) =1a(15) =1a(16) =27449a(17) =1042642a(18) =32596a(19) =57a(20) =1a(21) =1a(22) =1887284a(23) =34352419335a(24) =34359509614a(25) =2096731a(26) =120a(27) =1a(28) =1a(29) =252522481