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, -1, 0), (0, 1, -1), (1, 1, 1)}.
A149672
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, -1, 0), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =65a(5) =253a(6) =1071a(7) =4469a(8) =18995a(9) =82111a(10) =359215a(11) =1581495a(12) =7010885a(13) =31284419a(14) =140356821a(15) =632723871a(16) =2863416051a(17) =13002311353a(18) =59240248483a(19) =270728014969
External references
- oeis: A149672