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), (1, -1, 0), (1, 1, -1)}.
A148331
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), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =137a(7) =464a(8) =1626a(9) =5882a(10) =21677a(11) =81732a(12) =313304a(13) =1212616a(14) =4773498a(15) =18989434a(16) =75930374a(17) =307605618a(18) =1255603937a(19) =5139250646a(20) =21254360832a(21) =88416763064a(22) =368323147150
External references
- oeis: A148331