a(n) is the number of permutations of n elements with exactly one fixed point and no transpositions.
A221145
a(n) is the number of permutations of n elements with exactly one fixed point and no transpositions.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =8a(4) =30a(5) =144a(6) =1120a(7) =9120a(8) =80892a(9) =808640a(10) =8908416a(11) =106889760a(12) =1389405160a(13) =19452003648a(14) =291782125440
External references
- oeis: A221145