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, 1, 1), (0, 1, -1), (1, 0, 1)}.
A148857
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, 1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =96a(6) =339a(7) =1262a(8) =4910a(9) =18378a(10) =72680a(11) =289633a(12) =1147306a(13) =4619304a(14) =18857624a(15) =76773467a(16) =314714055a(17) =1301446478a(18) =5398971560a(19) =22414470746a(20) =93653492226a(21) =392944405090
External references
- oeis: A148857