| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 17 |
| 3 | 61 |
| 4 | 217 |
| 5 | 773 |
| 6 | 2753 |
| 7 | 9805 |
| 8 | 34921 |
| 9 | 124373 |
| 10 | 442961 |
| 11 | 1577629 |
| 12 | 5618809 |
| 13 | 20011685 |
| 14 | 71272673 |
| 15 | 253841389 |
| 16 | 904069513 |
| 17 | 3219891317 |
| 18 | 11467812977 |
| 19 | 40843221565 |
| 20 | 145465290649 |
| 21 | 518082315077 |
| 22 | 1845177526529 |
| 23 | 6571697209741 |
| 24 | 23405446682281 |
| 25 | 83359734466325 |
| 26 | 296890096763537 |
[1,5,17,61,217,773,2753,9805,34921,124373,442961, 1577629,5618809,20011685,71272673,253841389, 904069513,3219891317,11467812977,40843221565, 145465290649,518082315077,1845177526529, 6571697209741,23405446682281,83359734466325, 296890096763537] |