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, 1, 0), (1, -1, -1), (1, 1, 1)}.
A149556
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, 1, 0), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =191a(6) =895a(7) =3233a(8) =15359a(9) =58481a(10) =280269a(11) =1108705a(12) =5347725a(13) =21717057a(14) =105256693a(15) =435709221a(16) =2119708801a(17) =8908235721a(18) =43464520833a(19) =184891123055a(20) =904210326399
External references
- oeis: A149556