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, 0), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
A148613
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, 0), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =54a(6) =208a(7) =611a(8) =2491a(9) =7948a(10) =33628a(11) =113525a(12) =492930a(13) =1733922a(14) =7673528a(15) =27851685a(16) =125066046a(17) =465304001a(18) =2113510279a(19) =8022430212a(20) =36778270926a(21) =141937911217a(22) =655676836686
External references
- oeis: A148613