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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 30 |
| 5 | 69 |
| 6 | 160 |
| 7 | 371 |
| 8 | 859 |
| 9 | 1990 |
| 10 | 4610 |
| 11 | 10679 |
| 12 | 24738 |
| 13 | 57306 |
| 14 | 132750 |
| 15 | 307517 |
| 16 | 712367 |
| 17 | 1650207 |
| 18 | 3822725 |
| 19 | 8855390 |
| 20 | 20513621 |
| 21 | 47520058 |
| 22 | 110080805 |
| 23 | 255003553 |
| 24 | 590718900 |
| 25 | 1368407674 |
| 26 | 3169933385 |
| 27 | 7343190086 |
| 28 | 17010591104 |
| 29 | 39405245720 |
[1,3,5,13,30,69,160,371,859,1990,4610,10679,24738, 57306,132750,307517,712367,1650207,3822725, 8855390,20513621,47520058,110080805,255003553, 590718900,1368407674,3169933385,7343190086, 17010591104,39405245720] |