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, 0, 0), (-1, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
A148997
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, 0, 0), (-1, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =121a(6) =468a(7) =1859a(8) =7558a(9) =31270a(10) =131330a(11) =558115a(12) =2396603a(13) =10379648a(14) =45292679a(15) =198926208a(16) =878692550a(17) =3900981744a(18) =17396764823a(19) =77896353911a(20) =350065380105
External references
- oeis: A148997