Number of permutations of 3..n+2 with no element greater than or equal to the sum of its neighbors.
A180891
Number of permutations of 3..n+2 with no element greater than or equal to the sum of its neighbors.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =6a(4) =26a(5) =142a(6) =844a(7) =5686a(8) =42114a(9) =349630a(10) =3149222a(11) =31070272a(12) =328873208a(13) =3760018560a(14) =45762031978a(15) =595413789074
External references
- oeis: A180891