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, 0), (1, -1, 1)}.
A148421
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, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =18a(5) =57a(6) =198a(7) =717a(8) =2756a(9) =10529a(10) =41553a(11) =167333a(12) =683317a(13) =2810043a(14) =11743208a(15) =49541544a(16) =210275241a(17) =899164766a(18) =3877972563a(19) =16807996275a(20) =73177208572a(21) =320397904631
External references
- oeis: A148421