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), (-1, 0, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
A148840
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), (-1, 0, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =90a(6) =319a(7) =1167a(8) =4393a(9) =16770a(10) =65667a(11) =261142a(12) =1049235a(13) =4251083a(14) =17422677a(15) =71909371a(16) =298913230a(17) =1251993805a(18) =5278397210a(19) =22349721983a(20) =95054794883a(21) =406143454387
External references
- oeis: A148840