Triangle read by rows: number of topologies of n nested circles intersecting at most as binaries, according to number of factors.
A281348
Triangle read by rows: number of topologies of n nested circles intersecting at most as binaries, according to number of factors.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =5a(4) =2a(5) =1a(6) =16a(7) =8a(8) =2a(9) =1a(10) =53a(11) =26a(12) =8a(13) =2a(14) =1a(15) =189a(16) =100a(17) =30a(18) =8a(19) =2a(20) =1a(21) =694a(22) =375a(23) =115a(24) =30a(25) =8a(26) =2a(27) =1a(28) =2642a(29) =1473
External references
- oeis: A281348