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, 0), (-1, 1, 0), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.
A148413
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, 0), (-1, 1, 0), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =59a(6) =209a(7) =783a(8) =2969a(9) =11818a(10) =48041a(11) =197875a(12) =829325a(13) =3504606a(14) =15030624a(15) =65140862a(16) =284465160a(17) =1252897588a(18) =5548473208a(19) =24743623447a(20) =110991861676a(21) =500241513919
External references
- oeis: A148413