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, 1), (-1, 1, 0), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
A148749
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, 1), (-1, 1, 0), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =27a(5) =89a(6) =381a(7) =1463a(8) =6605a(9) =27581a(10) =128459a(11) =564399a(12) =2680865a(13) =12173593a(14) =58583667a(15) =272072935a(16) =1321194015a(17) =6234436507a(18) =30470804529a(19) =145470609863a(20) =714367698407
External references
- oeis: A148749