/sci/ - Science & Math

>>9236043
I don't usually do this, ask for help on /sci/ for my homework, but you're my final option. Anyone see any recurrence for N(k)?

I've tried N(3),N(4),N(5),N(6) by pen and paper and they go like this:
N(0)=0
N(1)=0
N(2)=2
N(3)=0
N(4)=2
N(5)=4
N(6)=1