Number of permutations of length n sortable by 5 passes through a pop-stack.
A293776
Number of permutations of length n sortable by 5 passes through a pop-stack.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4210a(8) =22782a(9) =117270a(10) =592121a(11) =2986213a(12) =15143820a(13) =77271338a(14) =395695883a(15) =2028110765a(16) =10390216994a(17) =53191249148a(18) =272166257616
External references
- oeis: A293776