Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 places and equal numbers of elements moved upwards and downwards.

A263740

Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 places and equal numbers of elements moved upwards and downwards.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =14a(4) =46a(5) =214a(6) =664a(7) =2516a(8) =7989a(9) =30299a(10) =104622a(11) =399316a(12) =1411880a(13) =5298114a(14) =18971986a(15) =70774024a(16) =256952680a(17) =957861715a(18) =3507882839a(19) =13059944402a(20) =48088198908a(21) =178984147550a(22) =661805950128

External references