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)}.
A148428
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) =2a(3) =5a(4) =18a(5) =63a(6) =246a(7) =966a(8) =3945a(9) =16467a(10) =70342a(11) =305616a(12) =1346621a(13) =6002092a(14) =27002568a(15) =122514743a(16) =559932241a(17) =2575770147a(18) =11915970386a(19) =55402390326a(20) =258732896169
External references
- oeis: A148428