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, 0, -1), (1, -1, 0), (1, 1, 0)}.
A149175
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, 0, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =35a(5) =117a(6) =429a(7) =1563a(8) =6023a(9) =23289a(10) =92152a(11) =369488a(12) =1502119a(13) =6160145a(14) =25528852a(15) =106682938a(16) =448960587a(17) =1901408027a(18) =8104762740a(19) =34722538926a(20) =149465829383a(21) =646360473228
External references
- oeis: A149175