Number of ways for n-3 nonintersecting loops to cross a line 2n times.
A007746
Number of ways for n-3 nonintersecting loops to cross a line 2n times.
Terms
- a(0) =42a(1) =640a(2) =5894a(3) =42840a(4) =271240a(5) =1569984a(6) =8536890a(7) =44346456a(8) =222516030a(9) =1086685600a(10) =5193298110a(11) =24384586200a(12) =112831907760a(13) =515709552000
External references
- oeis: A007746