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, -1), (1, -1, 1), (1, 1, 0), (1, 1, 1)}.
A150920
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, -1), (1, -1, 1), (1, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =32a(4) =155a(5) =644a(6) =3175a(7) =14098a(8) =69976a(9) =321879a(10) =1602721a(11) =7531433a(12) =37563469a(13) =179013811a(14) =893681771a(15) =4300873876a(16) =21483003773a(17) =104127014063a(18) =520295910233
External references
- oeis: A150920