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, 0), (-1, 0, 0), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
A148835
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, 0), (-1, 0, 0), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =90a(6) =314a(7) =1128a(8) =4125a(9) =15617a(10) =59436a(11) =230199a(12) =899121a(13) =3548174a(14) =14149729a(15) =56737430a(16) =229465613a(17) =932484468a(18) =3812198941a(19) =15663469773a(20) =64627311946a(21) =267921946059
External references
- oeis: A148835