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, -1, -1), (-1, 0, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148158
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, -1, -1), (-1, 0, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =30a(6) =99a(7) =321a(8) =1125a(9) =3994a(10) =14669a(11) =54883a(12) =210009a(13) =816899a(14) =3221481a(15) =12875307a(16) =51984975a(17) =211956185a(18) =871637092a(19) =3613651770a(20) =15086421954a(21) =63391684221a(22) =267934026055
External references
- oeis: A148158