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, 1), (1, 0, -1), (1, 0, 0), (1, 1, -1)}.
A148353
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, 1), (1, 0, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =44a(6) =154a(7) =514a(8) =1949a(9) =7100a(10) =28289a(11) =109269a(12) =450989a(13) =1814897a(14) =7692208a(15) =31909424a(16) =138042852a(17) =586240058a(18) =2577374384a(19) =11152156893a(20) =49670880217a(21) =218216089703a(22) =982348019505
External references
- oeis: A148353