Number of length n arrays of permutations of 0..n-1 with each element moved by -2 to 2 places and exactly one more element moved upwards than downwards.

A263758

Number of length n arrays of permutations of 0..n-1 with each element moved by -2 to 2 places and exactly one more element moved upwards than downwards.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =2a(4) =6a(5) =14a(6) =38a(7) =88a(8) =217a(9) =506a(10) =1209a(11) =2810a(12) =6600a(13) =15308a(14) =35653a(15) =82532a(16) =191371a(17) =442428a(18) =1023499a(19) =2364324a(20) =5463084a(21) =12614628a(22) =29131729a(23) =67256334a(24) =155289747a(25) =358522126a(26) =827816037a(27) =1911447100a(28) =4414086763a(29) =10194246046

External references