Number of permutations of 4..n+3 with no element greater than or equal to the sum of its neighbors.
A180892
Number of permutations of 4..n+3 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) =168a(6) =1078a(7) =7544a(8) =59202a(9) =504340a(10) =4724672a(11) =47582366a(12) =519090056a(13) =6039933544a(14) =75306132788a(15) =994433862242
External references
- oeis: A180892