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, 0), (-1, 0, -1), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
A148826
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, 0), (-1, 0, -1), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =85a(6) =309a(7) =1081a(8) =4021a(9) =14818a(10) =57434a(11) =219829a(12) =860342a(13) =3378196a(14) =13535973a(15) =54126261a(16) =218569721a(17) =887699416a(18) =3636969474a(19) =14921133627a(20) =61547442196a(21) =255197583836
External references
- oeis: A148826