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, 1), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148856
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, 1), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =93a(6) =345a(7) =1247a(8) =4905a(9) =18621a(10) =75573a(11) =297895a(12) =1235431a(13) =5004478a(14) =21069953a(15) =87081849a(16) =370961528a(17) =1556555814a(18) =6694323743a(19) =28429384992a(20) =123233469423a(21) =528551018694
External references
- oeis: A148856