Number of alternating fixed-point-free permutations on n letters.
A129817
Number of alternating fixed-point-free permutations on n letters.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =6a(6) =24a(7) =102a(8) =528a(9) =2952a(10) =19008a(11) =131112a(12) =1009728a(13) =8271792a(14) =74167488a(15) =703077552a(16) =7194754368a(17) =77437418112a(18) =890643066048
External references
- oeis: A129817