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

A264879

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

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =7a(5) =20a(6) =49a(7) =175a(8) =323a(9) =1085a(10) =2290a(11) =6489a(12) =15751a(13) =41749a(14) =105514a(15) =276079a(16) =706396a(17) =1825615a(18) =4714184a(19) =12103729a(20) =31297188a(21) =80431077a(22) =207561706a(23) =534335127a(24) =1377615603a(25) =3548250067a(26) =9145959294a(27) =23561913471a(28) =60719538527a(29) =156456169973

External references