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, 0), (1, -1, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148982
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, 0), (1, -1, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =112a(6) =421a(7) =1605a(8) =6355a(9) =25406a(10) =103844a(11) =428179a(12) =1791014a(13) =7548478a(14) =32138386a(15) =137694930a(16) =594387179a(17) =2579410260a(18) =11258896341a(19) =49364497947a(20) =217448108770a(21) =961501842191
External references
- oeis: A148982