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, 1), (1, 0, -1), (1, 0, 1)}.
A148731
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, 1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =74a(6) =263a(7) =839a(8) =3093a(9) =10516a(10) =39141a(11) =135910a(12) =516046a(13) =1838960a(14) =7012773a(15) =25280377a(16) =97338047a(17) =356457878a(18) =1375147361a(19) =5071061128a(20) =19684481356a(21) =73304618000a(22) =284919096885
External references
- oeis: A148731