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), (0, 0, 1), (0, 1, 0), (0, 1, 1), (1, 0, 1)}.
A151243
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), (0, 0, 1), (0, 1, 0), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =68a(4) =302a(5) =1368a(6) =6286a(7) =29252a(8) =137362a(9) =649364a(10) =3087370a(11) =14748464a(12) =70725462a(13) =340273352a(14) =1641776542a(15) =7940754972a(16) =38488807306a(17) =186906855308a(18) =909163023138
External references
- oeis: A151243