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, 0), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
A148890
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, 0), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =31a(5) =99a(6) =405a(7) =1419a(8) =5953a(9) =22065a(10) =96413a(11) =370294a(12) =1634168a(13) =6465684a(14) =28845552a(15) =116211498a(16) =525501390a(17) =2151401160a(18) =9780421638a(19) =40586651280a(20) =185562016495a(21) =777580903830
External references
- oeis: A148890