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, 0), (-1, 0, 0), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
A149670
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, 0), (-1, 0, 0), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =63a(5) =259a(6) =1067a(7) =4441a(8) =19171a(9) =82665a(10) =359847a(11) =1592493a(12) =7054023a(13) =31408477a(14) =141222211a(15) =635735405a(16) =2871906307a(17) =13053172561a(18) =59402203413a(19) =271013152957
External references
- oeis: A149670