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, 1, -1), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148270
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, 1, -1), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =39a(6) =145a(7) =410a(8) =1655a(9) =5135a(10) =21037a(11) =67972a(12) =287302a(13) =969331a(14) =4131266a(15) =14283037a(16) =61907458a(17) =219559838a(18) =956736125a(19) =3448784127a(20) =15184164319a(21) =55670274815a(22) =246050979513a(23) =912720690972
External references
- oeis: A148270