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, 0), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
A148131
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, 0), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =27a(6) =88a(7) =251a(8) =865a(9) =2647a(10) =9625a(11) =31124a(12) =117187a(13) =394565a(14) =1521086a(15) =5271938a(16) =20758265a(17) =73741969a(18) =294723790a(19) =1067134981a(20) =4321252882a(21) =15901492296a(22) =65085037328a(23) =242796852919
External references
- oeis: A148131