User:Crassworm

http://www.research.att.com/~njas/sequences/A023438 Dying rabbits

http://www.research.att.com/~njas/sequences/A084386 Number of pairs of rabbits when there are 3 pairs per litter and offspring reach parenthood after 3 gestation periods.

http://www.research.att.com/~njas/sequences/A072465 A Fibonacci-like model in which each pair of rabbits dies after the birth of their 4-th litter: a(n) = a(n-2) + a(n-3) + a(n-4) + a(n-5).

http://www.research.att.com/~njas/sequences/A028859 y=1, a=2

y=1, a, f=1, i=inf: nth a-nacci number: $$p(n) = \sum_{j=1}^a p(n-j)$$

$$p(n) = p(n-1) + yp(n-f) - yp(n-i)$$

$$p(n) = 0$$ when $$n < 0$$

$$p(n) = 1$$ when $$n = 0$$

$$p(n) = p(n) - 1$$ when $$n = a$$