Number of permutations of 1..n containing the relative rank sequence { 213465 } at any spacing.
A159139
Number of permutations of 1..n containing the relative rank sequence { 213465 } at any spacing.
Terms
- a(0) =1a(1) =37a(2) =891a(3) =18043a(4) =337210a(5) =6081686a(6) =108469917a(7) =1941309261a(8) =35187952132a(9) =649951312000
External references
- oeis: A159139