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, 1, 1), (0, 0, -1), (1, 0, 1)}.
A148673
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, 1, 1), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =62a(6) =201a(7) =633a(8) =2067a(9) =6768a(10) =22871a(11) =77198a(12) =264384a(13) =906396a(14) =3145281a(15) =10935879a(16) =38320745a(17) =134570558a(18) =475469721a(19) =1683213060a(20) =5986055526a(21) =21332299530a(22) =76302127859a(23) =273399809978a(24) =982457173368
External references
- oeis: A148673