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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 34 |
| 3 | 161 |
| 4 | 717 |
| 5 | 3245 |
| 6 | 14988 |
| 7 | 70220 |
| 8 | 329692 |
| 9 | 1554991 |
| 10 | 7348544 |
| 11 | 34783369 |
| 12 | 164707073 |
| 13 | 780082143 |
| 14 | 3694519412 |
| 15 | 17497209152 |
| 16 | 82864915694 |
| 17 | 392436915282 |
| 18 | 1858523413836 |
| 19 | 8801702771851 |
| 20 | 41683674474943 |
| 21 | 197408500938927 |
[16,34,161,717,3245,14988,70220,329692,1554991, 7348544,34783369,164707073,780082143,3694519412, 17497209152,82864915694,392436915282, 1858523413836,8801702771851,41683674474943, 197408500938927] |