A010374 Number of directed site animals with no loops enumerated by area (or number of sites).
1, 2, 5, 12, 29, 72, 182, 464, 1190, 3070, 7958, 20706
Offset: 1
References
- Andrew Conway, J. Phys. A28, L125 (1995), J. Phys. A26, 3085 (1993)