Number of length n arrays of permutations of 0..n-1 with each element moved by -2 to 2 places and the total absolute value of displacements not greater than n.
A263933
Number of length n arrays of permutations of 0..n-1 with each element moved by -2 to 2 places and the total absolute value of displacements not greater than n.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =11a(4) =17a(5) =49a(6) =80a(7) =249a(8) =414a(9) =1237a(10) =2099a(11) =6314a(12) =10846a(13) =32254a(14) =56036a(15) =166127a(16) =291145a(17) =858237a(18) =1515675a(19) =4450576a(20) =7910979a(21) =23136531a(22) =41361393a(23) =120553201a(24) =216600707a(25) =629294119a(26) =1135763262a(27) =3290238806a(28) =5962334608a(29) =17226509737
External references
- oeis: A263933