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, 1, 0), (0, 0, -1), (0, 0, 1), (1, 0, 1)}.
A150335
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, 1, 0), (0, 0, -1), (0, 0, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =23a(4) =84a(5) =320a(6) =1262a(7) =5098a(8) =21051a(9) =87729a(10) =371394a(11) =1584946a(12) =6832849a(13) =29666458a(14) =129708627a(15) =570060258a(16) =2519251688a(17) =11178295951a(18) =49819703001a(19) =222797463880a(20) =999874253662
External references
- oeis: A150335