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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 35 |
| 5 | 91 |
| 6 | 234 |
| 7 | 566 |
| 8 | 1353 |
| 9 | 3133 |
| 10 | 7172 |
| 11 | 16108 |
| 12 | 35871 |
| 13 | 78891 |
| 14 | 172338 |
| 15 | 373386 |
| 16 | 804649 |
| 17 | 1723957 |
| 18 | 3678128 |
| 19 | 7813748 |
| 20 | 16543943 |
| 21 | 34913591 |
| 22 | 73480386 |
| 23 | 154249498 |
| 24 | 323078245 |
| 25 | 675271797 |
| 26 | 1408772440 |
| 27 | 2933901672 |
| 28 | 6100500103 |
[1,4,12,35,91,234,566,1353,3133,7172,16108,35871, 78891,172338,373386,804649,1723957,3678128, 7813748,16543943,34913591,73480386,154249498, 323078245,675271797,1408772440,2933901672, 6100500103] |