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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148590
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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =55a(6) =206a(7) =654a(8) =2563a(9) =8800a(10) =35718a(11) =130207a(12) =541770a(13) =2054906a(14) =8698409a(15) =34033759a(16) =146141882a(17) =585604786a(18) =2541893678a(19) =10381735748a(20) =45477053043a(21) =188672305570a(22) =832663144479
External references
- oeis: A148590