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, 0), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
A149705
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, 0), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =285a(6) =1233a(7) =5359a(8) =23959a(9) =107925a(10) =491337a(11) =2256035a(12) =10436057a(13) =48518807a(14) =226804345a(15) =1064891773a(16) =5018350417a(17) =23729155959a(18) =112551561343a(19) =535260211983
External references
- oeis: A149705