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, -1, 0), (-1, 1, 0), (0, 0, 1), (1, 0, 0)}.
A149855
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, -1, 0), (-1, 1, 0), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =37a(5) =119a(6) =397a(7) =1364a(8) =4690a(9) =16567a(10) =60099a(11) =221639a(12) =824168a(13) =3076794a(14) =11626300a(15) =44410611a(16) =171024300a(17) =661133266a(18) =2566409626a(19) =10027307231a(20) =39409100079a(21) =155553063846a(22) =615628813008
External references
- oeis: A149855