Number of permutations of 7..n+6 with no element greater than or equal to the sum of its neighbors.
A180895
Number of permutations of 7..n+6 with no element greater than or equal to the sum of its neighbors.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =6a(4) =30a(5) =180a(6) =1260a(7) =10080a(8) =88200a(9) =846360a(10) =8704560a(11) =96521328a(12) =1136939886a(13) =14300688576a(14) =190022230230
External references
- oeis: A180895