Number of permutations of 6..n+5 with no element greater than or equal to the sum of its neighbors.
A180894
Number of permutations of 6..n+5 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) =9720a(8) =83100a(9) =765456a(10) =7666722a(11) =82008890a(12) =943538544a(13) =11524375162a(14) =150143430468
External references
- oeis: A180894