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, 0), (-1, 0, 1), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
A148479
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, 0), (-1, 0, 1), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =69a(6) =249a(7) =943a(8) =3694a(9) =14787a(10) =60275a(11) =249800a(12) =1049734a(13) =4461021a(14) =19139414a(15) =82811849a(16) =360977604a(17) =1583710287a(18) =6987944009a(19) =30991468703a(20) =138079317470a(21) =617743638777
External references
- oeis: A148479