Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,2 or 2,-2.

A264054

Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,2 or 2,-2.

Terms

    a(0) =2a(1) =8a(2) =18a(3) =45a(4) =125a(5) =320a(6) =832a(7) =2197a(8) =5733a(9) =14994a(10) =39304a(11) =102850a(12) =269225a(13) =704969a(14) =1845504a(15) =4831488a(16) =12649337a(17) =33116057a(18) =86698690a(19) =226981000a(20) =594243090a(21) =1555747893a(22) =4073003173a(23) =10663258432a(24) =27916771136a(25) =73087061741a(26) =191344405725

External references