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, 0), (1, -1, 1), (1, 1, 0)}.
A149139
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, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =36a(5) =110a(6) =440a(7) =1485a(8) =6038a(9) =21770a(10) =90166a(11) =335868a(12) =1405402a(13) =5375252a(14) =22720338a(15) =88585501a(16) =376880976a(17) =1490018552a(18) =6375130214a(19) =25514622182a(20) =109661163910a(21) =442953363234
External references
- oeis: A149139