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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 10 |
| 3 | 30 |
| 4 | 85 |
| 5 | 233 |
| 6 | 636 |
| 7 | 1733 |
| 8 | 4714 |
| 9 | 12817 |
| 10 | 34843 |
| 11 | 94717 |
| 12 | 257472 |
| 13 | 699885 |
| 14 | 1902489 |
| 15 | 5171506 |
| 16 | 14057617 |
| 17 | 38212570 |
| 18 | 103872539 |
| 19 | 282354840 |
| 20 | 767520035 |
| 21 | 2086335769 |
| 22 | 5671248615 |
| 23 | 15416052061 |
| 24 | 41905174191 |
| 25 | 113910073528 |
| 26 | 309639682957 |
[3,10,30,85,233,636,1733,4714,12817,34843,94717, 257472,699885,1902489,5171506,14057617,38212570, 103872539,282354840,767520035,2086335769, 5671248615,15416052061,41905174191,113910073528, 309639682957] |