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

A264091

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

Terms

    a(0) =8a(1) =39a(2) =245a(3) =1448a(4) =8788a(5) =52941a(6) =319906a(7) =1931215a(8) =11662916a(9) =70424784a(10) =425271833a(11) =2568026357a(12) =15507276040a(13) =93641933931a(14) =565464943933

External references