Yeah, type 1 in A1, 2 in A2, then select cells A1 and A2.
With A1 and A2 selected, grab the bottom right corner of A2 (the pointer will change), and drag down to A16. Excel will auto fill 3 - 16.
After the above, you could just copy A1 - A16 and paste in A17, A33, etc to repeat the 1-16 count.