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), (1, 0, 0), (1, 0, 1)}.
A149862
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), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =40a(5) =123a(6) =403a(7) =1304a(8) =4497a(9) =15299a(10) =53927a(11) =187356a(12) =675747a(13) =2404640a(14) =8768830a(15) =31561721a(16) =116600798a(17) =425605898a(18) =1582744720a(19) =5818657133a(20) =21820279075a(21) =80958949738a(22) =304934255240
External references
- oeis: A149862