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, -1), (0, 1, 0), (1, 0, 1)}.
A149993
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, -1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =59a(5) =204a(6) =755a(7) =2886a(8) =10983a(9) =42642a(10) =169339a(11) =673729a(12) =2696817a(13) =10941944a(14) =44610497a(15) =182309217a(16) =750649555a(17) =3106888066a(18) =12882897639a(19) =53637560223a(20) =224296097237a(21) =939822049608
External references
- oeis: A149993