Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and equal numbers of elements moved upwards and downwards.
A263739
Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and equal numbers of elements moved upwards and downwards.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =14a(4) =36a(5) =110a(6) =277a(7) =823a(8) =2292a(9) =6862a(10) =19518a(11) =57932a(12) =167852a(13) =499181a(14) =1464997a(15) =4360738a(16) =12891144a(17) =38436616a(18) =114235572a(19) =341264028a(20) =1018047671a(21) =3046747775a(22) =9114371288a(23) =27322966348a(24) =81915150788a(25) =245937559472a(26) =738620368466
External references
- oeis: A263739