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, 0, -1), (0, 1, -1), (1, 0, 0)}.
A148287
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, 0, -1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =35a(6) =107a(7) =329a(8) =1096a(9) =3749a(10) =12891a(11) =46265a(12) =169259a(13) =620390a(14) =2337429a(15) =8934790a(16) =34152776a(17) =133143500a(18) =524875592a(19) =2067248994a(20) =8264941659a(21) =33337264862a(22) =134285940718a(23) =547393149232
External references
- oeis: A148287