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, 0, 1), (0, 0, 1), (0, 1, -1), (1, -1, 1)}.
A148145
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, 0, 1), (0, 0, 1), (0, 1, -1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =29a(6) =88a(7) =263a(8) =849a(9) =2723a(10) =9157a(11) =30722a(12) =106294a(13) =367742a(14) =1299180a(15) =4595014a(16) =16493712a(17) =59306116a(18) =215549417a(19) =784975686a(20) =2881728074a(21) =10600876580a(22) =39237430745a(23) =145524254095a(24) =542325039961
External references
- oeis: A148145