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), (1, -1, -1), (1, 1, 1)}.
A149498
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), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =45a(5) =109a(6) =509a(7) =1517a(8) =6757a(9) =22461a(10) =98997a(11) =345653a(12) =1529269a(13) =5506201a(14) =24429845a(15) =90301037a(16) =400891885a(17) =1513502725a(18) =6723798125a(19) =25795029197a(20) =114713713765a(21) =445819303429
External references
- oeis: A149498