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, 1), (0, 1, -1), (1, 0, 1)}.
A149347
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, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =42a(5) =151a(6) =578a(7) =2213a(8) =8692a(9) =34390a(10) =138697a(11) =560620a(12) =2289920a(13) =9390621a(14) =38814879a(15) =160867961a(16) =670118507a(17) =2799480186a(18) =11742654551a(19) =49366635903a(20) =208158082202a(21) =879572305693
External references
- oeis: A149347