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, -1), (0, 0, 1), (0, 1, 1), (1, -1, 0)}.
A149890
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, -1), (0, 0, 1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =45a(5) =153a(6) =548a(7) =2019a(8) =7617a(9) =29412a(10) =115631a(11) =460957a(12) =1862485a(13) =7606505a(14) =31355446a(15) =130380787a(16) =546133589a(17) =2302845826a(18) =9770066898a(19) =41673128968a(20) =178635594272a(21) =769249036219
External references
- oeis: A149890