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, -1), (-1, 0, 0), (0, -1, 1), (1, 1, 0)}.
A149172
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, -1), (-1, 0, 0), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =33a(5) =117a(6) =389a(7) =1471a(8) =5400a(9) =20343a(10) =79235a(11) =305897a(12) =1209618a(13) =4815788a(14) =19257434a(15) =77913848a(16) =316467071a(17) =1292277438a(18) =5311275382a(19) =21899703829a(20) =90691380350a(21) =377154613794
External references
- oeis: A149172