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)}.
A148089
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) =2a(3) =4a(4) =10a(5) =24a(6) =69a(7) =193a(8) =590a(9) =1764a(10) =5563a(11) =17405a(12) =56664a(13) =183567a(14) =610476a(15) =2021736a(16) =6829184a(17) =23033270a(18) =78880450a(19) =269888858a(20) =933922349a(21) =3230929825a(22) =11279210350a(23) =39390678315a(24) =138553842436a(25) =487618273180
External references
- oeis: A148089