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, 0), (0, 0, -1), (0, 1, 1), (1, -1, -1)}.
A148596
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, 0), (0, 0, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =58a(6) =181a(7) =614a(8) =2019a(9) =7141a(10) =25123a(11) =89366a(12) =329988a(13) =1206024a(14) =4505670a(15) =17008519a(16) =64177639a(17) =246706347a(18) =948075463a(19) =3668414666a(20) =14342199627a(21) =56019992182a(22) =220812556828a(23) =873603491381
External references
- oeis: A148596