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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 100 |
| 3 | 1100100 |
| 4 | 100001100100101000100 |
| 5 | 1010110101111001011010001101011011001100110110011001100101110100100 |
[4,100,1100100,100001100100101000100, 10101101011110010110100011010110110011001101100110\ 01100101110100100] |