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, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149693
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, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =273a(6) =1145a(7) =4967a(8) =21943a(9) =96751a(10) =436505a(11) =1977233a(12) =9047955a(13) =41693525a(14) =192513737a(15) =895929351a(16) =4183745769a(17) =19611361947a(18) =92301890711a(19) =435182661003
External references
- oeis: A149693