Number of reverse alternating fixed-point-free permutations on n letters.
A129815
Number of reverse alternating fixed-point-free permutations on n letters.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =2a(4) =6a(5) =22a(6) =102a(7) =506a(8) =2952a(9) =18502a(10) =131112a(11) =991226a(12) =8271792a(13) =73176262a(14) =703077552a(15) =7121578106a(16) =77437418112a(17) =883521487942
External references
- oeis: A129815