Number of permutations of 1..n with no adjacent elements within 7 in value.
A179961
Number of permutations of 1..n with no adjacent elements within 7 in value.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =2a(17) =1664a(18) =395576a(19) =40495488a(20) =2779045440a(21) =147689145984
External references
- oeis: A179961