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

A264649

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

Terms

    a(0) =1a(1) =2a(2) =4a(3) =9a(4) =18a(5) =41a(6) =84a(7) =176a(8) =369a(9) =772a(10) =1625a(11) =3406a(12) =7156a(13) =15025a(14) =31542a(15) =66225a(16) =139016a(17) =291856a(18) =612705a(19) =1286296a(20) =2700433a(21) =5669210a(22) =11901844a(23) =24986425a(24) =52455914a(25) =110124697a(26) =231193116a(27) =485361376a(28) =1018956049a(29) =2139172156

External references