The number of permutations of {1,1,1,1,1,2,2,2,2,2,...,n,n,n,n,n} with the property that b(1) >= b(2) >= ... >= b(n), where five k's are skipped by b(k) for k=1..n.
A332773
The number of permutations of {1,1,1,1,1,2,2,2,2,2,...,n,n,n,n,n} with the property that b(1) >= b(2) >= ... >= b(n), where five k's are skipped by b(k) for k=1..n.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =16a(4) =104a(5) =508a(6) =5136a(7) =28224a(8) =333360a(9) =2793888a(10) =34010208a(11) =276522240a(12) =5903380896a(13) =50068045536a(14) =892740867024
External references
- oeis: A332773