A179967 Number of permutations of 1..2*n+9 with no adjacent elements within n in value.
362880, 5296790, 88422296, 1634227958, 32096768008, 649347224736
Offset: 0
Extensions
a(0)=362880 prepended by Seiichi Manyama, Dec 01 2018
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.