Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.

A264874

Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =20a(4) =56a(5) =137a(6) =295a(7) =709a(8) =1983a(9) =5280a(10) =13521a(11) =34173a(12) =85993a(13) =219721a(14) =567894a(15) =1461417a(16) =3737198a(17) =9546206a(18) =24410323a(19) =62518425a(20) =160259301a(21) =410562684a(22) =1050999521a(23) =2690293140a(24) =6888161028a(25) =17639430568a(26) =45173289641a(27) =115675667529

External references