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, 0), (0, 1, -1), (1, -1, 0), (1, 1, 0)}.
A149180
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, 0), (0, 1, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =36a(5) =119a(6) =453a(7) =1691a(8) =6640a(9) =26444a(10) =107761a(11) =445570a(12) =1866616a(13) =7916881a(14) =33923740a(15) =146666902a(16) =639199703a(17) =2805469930a(18) =12395141339a(19) =55081556226a(20) =246070109241
External references
- oeis: A149180