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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, -1), (1, -1, 1)}.
A148351
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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, -1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =44a(6) =147a(7) =495a(8) =1758a(9) =6392a(10) =23877a(11) =90960a(12) =352682a(13) =1388471a(14) =5536070a(15) =22333566a(16) =90999168a(17) =374144507a(18) =1550788644a(19) =6474314495a(20) =27208663317a(21) =115026686024a(22) =488951418197
External references
- oeis: A148351