The number of permutations p of {1,...,n} such that |p(i)-p(i+1)| is in {2,3} for all i from 1 to n-1.
A174703
The number of permutations p of {1,...,n} such that |p(i)-p(i+1)| is in {2,3} for all i from 1 to n-1.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =12a(6) =8a(7) =12a(8) =30a(9) =72a(10) =106a(11) =128a(12) =186a(13) =316a(14) =546a(15) =836a(16) =1186a(17) =1756a(18) =2720a(19) =4224a(20) =6366a(21) =9374a(22) =13932a(23) =20958a(24) =31470a(25) =46820a(26) =69194a(27) =102458a(28) =152152a(29) =225548
External references
- oeis: A174703