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), (1, 0, 0), (1, 1, 1)}.
A150069
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), (1, 0, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =64a(5) =214a(6) =814a(7) =2868a(8) =11106a(9) =40226a(10) =157438a(11) =580488a(12) =2287292a(13) =8539150a(14) =33787222a(15) =127290058a(16) =505086688a(17) =1916121974a(18) =7618099994a(19) =29058731236a(20) =115694034728a(21) =443258790918
External references
- oeis: A150069