Number of self-inverse permutations p on [n] with displacement of elements restricted by 10: |p(i)-i| <= 10.
A239082
Number of self-inverse permutations p on [n] with displacement of elements restricted by 10: |p(i)-i| <= 10.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =76a(7) =232a(8) =764a(9) =2620a(10) =9496a(11) =35696a(12) =130656a(13) =464036a(14) =1615276a(15) =5517828a(16) =18628384a(17) =62330046a(18) =207657610a(19) =690610926a(20) =2299356168a(21) =7678084407a(22) =25759043565a(23) =86697055428a(24) =292427968880a(25) =987581324508
External references
- oeis: A239082