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, 1), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
A149673
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, 1), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =65a(5) =255a(6) =1051a(7) =4337a(8) =18319a(9) =77799a(10) =335201a(11) =1450767a(12) =6335303a(13) =27779333a(14) =122569423a(15) =542725045a(16) =2414192351a(17) =10771535425a(18) =48230144207a(19) =216516379107a(20) =974747732287
External references
- oeis: A149673