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 $n=a$