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, -1), (-1, -1, 0), (-1, 0, 0), (1, -1, 1), (1, 1, 0)}.
A149129
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, -1), (-1, -1, 0), (-1, 0, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =34a(5) =105a(6) =401a(7) =1367a(8) =5376a(9) =19217a(10) =77135a(11) =286441a(12) =1165086a(13) =4445413a(14) =18279080a(15) =71040581a(16) =294740394a(17) =1162167377a(18) =4855586573a(19) =19378156339a(20) =81423246854a(21) =328163065039
External references
- oeis: A149129