Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149435
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =46a(5) =166a(6) =616a(7) =2317a(8) =8818a(9) =33862a(10) =130906a(11) =508690a(12) =1985158a(13) =7773886a(14) =30528118a(15) =120165583a(16) =473939962a(17) =1872379006a(18) =7407691624a(19) =29343102082a(20) =116356441630a(21) =461821527304
External references
- oeis: A149435