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, 0, 0), (-1, 1, 0), (0, 1, 1), (1, 0, -1)}.
A148442
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, 0, 0), (-1, 1, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =16a(5) =46a(6) =155a(7) =501a(8) =1686a(9) =5991a(10) =21017a(11) =76040a(12) =280654a(13) =1035640a(14) =3896052a(15) =14780804a(16) =56362934a(17) =217403028a(18) =842891300a(19) =3286540585a(20) =12904895803a(21) =50886586718a(22) =201628355072a(23) =802775113349
External references
- oeis: A148442