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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 43 |
| 5 | 130 |
| 6 | 392 |
| 7 | 1177 |
| 8 | 3532 |
| 9 | 10598 |
| 10 | 31795 |
| 11 | 95386 |
| 12 | 286160 |
| 13 | 858481 |
| 14 | 2575444 |
| 15 | 7726334 |
| 16 | 23179003 |
| 17 | 69537010 |
| 18 | 208611032 |
| 19 | 625833097 |
| 20 | 1877499292 |
| 21 | 5632497878 |
| 22 | 16897493635 |
| 23 | 50692480906 |
| 24 | 152077442720 |
| 25 | 456232328161 |
[1,4,14,43,130,392,1177,3532,10598,31795,95386, 286160,858481,2575444,7726334,23179003,69537010, 208611032,625833097,1877499292,5632497878, 16897493635,50692480906,152077442720,456232328161] |