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, 0, -1), (0, -1, 1), (0, 1, 0), (1, -1, -1)}.
A148009
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, 0, -1), (0, -1, 1), (0, 1, 0), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =44a(7) =101a(8) =324a(9) =807a(10) =2562a(11) =6874a(12) =22021a(13) =63456a(14) =208798a(15) =634362a(16) =2070911a(17) =6467596a(18) =21207233a(19) =68259541a(20) =227890492a(21) =755089500a(22) =2534135422a(23) =8468506831a(24) =28559647176a(25) =96623136254a(26) =330263074825
External references
- oeis: A148009