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), (0, 1, 0), (1, -1, 1), (1, 0, 0)}.
A149970
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), (0, 1, 0), (1, -1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =55a(5) =197a(6) =748a(7) =2932a(8) =11760a(9) =48327a(10) =201782a(11) =855048a(12) =3670480a(13) =15915281a(14) =69678167a(15) =307527826a(16) =1366946587a(17) =6116052551a(18) =27519545886a(19) =124474386121a(20) =565674672324
External references
- oeis: A149970