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), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149388
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), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =50a(5) =177a(6) =773a(7) =3045a(8) =13714a(9) =57347a(10) =263327a(11) =1142167a(12) =5317464a(13) =23659581a(14) =111278882a(15) =504405697a(16) =2390882824a(17) =10990205688a(18) =52412270991a(19) =243568196451
External references
- oeis: A149388