Closed meandric numbers (or meanders): number of ways a loop can cross a road 2n times.
A005315
Closed meandric numbers (or meanders): number of ways a loop can cross a road 2n times.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =42a(5) =262a(6) =1828a(7) =13820a(8) =110954a(9) =933458a(10) =8152860a(11) =73424650a(12) =678390116a(13) =6405031050a(14) =61606881612a(15) =602188541928
External references
- oeis: A005315