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, 1, 0), (1, 0, -1)}.
A149888
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, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =45a(5) =152a(6) =540a(7) =1969a(8) =7418a(9) =28434a(10) =111308a(11) =441236a(12) =1774897a(13) =7205483a(14) =29576110a(15) =122297025a(16) =509955451a(17) =2138900800a(18) =9031575329a(19) =38322118872a(20) =163491504018a(21) =700349095867
External references
- oeis: A149888