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, 1), (-1, 0, 1), (1, -1, 1), (1, 1, 0)}.
A149151
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, 1), (-1, 0, 1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =38a(5) =117a(6) =473a(7) =1627a(8) =6781a(9) =24491a(10) =103183a(11) =385432a(12) =1643302a(13) =6283473a(14) =26949455a(15) =105057704a(16) =452722835a(17) =1789652210a(18) =7743159255a(19) =30968509503a(20) =134376514919a(21) =542440479936
External references
- oeis: A149151