Triangle read by rows: T(n,k) is the number of graphs with loops on n unlabeled vertices with k loops.
A361404
Triangle read by rows: T(n,k) is the number of graphs with loops on n unlabeled vertices with k loops.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =2a(6) =4a(7) =6a(8) =6a(9) =4a(10) =11a(11) =20a(12) =28a(13) =20a(14) =11a(15) =34a(16) =90a(17) =148a(18) =148a(19) =90a(20) =34a(21) =156a(22) =544a(23) =1144a(24) =1408a(25) =1144a(26) =544a(27) =156a(28) =1044a(29) =5096
External references
- oeis: A361404