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, 0, -1), (0, -1, 0), (1, 1, -1), (1, 1, 1)}.
A149595
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, 0, -1), (0, -1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =59a(5) =219a(6) =921a(7) =3729a(8) =15511a(9) =66307a(10) =285723a(11) =1231425a(12) =5377117a(13) =23746851a(14) =104998531a(15) =465502605a(16) =2084418377a(17) =9360389879a(18) =42066742411a(19) =189986019637a(20) =861969546027
External references
- oeis: A149595