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), (-1, 1, 1), (1, -1, 1), (1, 0, 0)}.
A148271
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), (-1, 1, 1), (1, -1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =39a(6) =151a(7) =433a(8) =1709a(9) =5280a(10) =22022a(11) =71793a(12) =303871a(13) =1023620a(14) =4371400a(15) =15150011a(16) =65796555a(17) =233352833a(18) =1020880390a(19) =3682945922a(20) =16198234948a(21) =59334969586a(22) =262976270037a(23) =975960981965
External references
- oeis: A148271