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, 1, 0), (1, -1, 0), (1, 1, 0)}.
A149146
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, 1, 0), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =38a(5) =105a(6) =465a(7) =1445a(8) =6576a(9) =21967a(10) =101705a(11) =356515a(12) =1671330a(13) =6069369a(14) =28713106a(15) =107128585a(16) =510306830a(17) =1944968189a(18) =9315345145a(19) =36124224529a(20) =173774490354a(21) =683637900503
External references
- oeis: A149146