Triangle read by rows: number of topologies of n nested circles intersecting at most as triples, according to number of factors.
A281350
Triangle read by rows: number of topologies of n nested circles intersecting at most as triples, according to number of factors.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =11a(4) =2a(5) =1a(6) =44a(7) =14a(8) =2a(9) =1a(10) =169a(11) =66a(12) =14a(13) =2a(14) =1a(15) =609a(16) =323a(17) =70a(18) =14a(19) =2a(20) =1a(21) =2253a(22) =1431a(23) =356a(24) =70a(25) =14a(26) =2a(27) =1a(28) =8779a(29) =6320
External references
- oeis: A281350