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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 35 |
| 3 | 129 |
| 4 | 374 |
| 5 | 839 |
| 6 | 1717 |
| 7 | 3276 |
| 8 | 5983 |
| 9 | 10579 |
| 10 | 18278 |
| 11 | 31041 |
| 12 | 52049 |
| 13 | 86450 |
| 14 | 142579 |
| 15 | 233925 |
| 16 | 382318 |
| 17 | 623083 |
| 18 | 1013381 |
| 19 | 1645704 |
| 20 | 2669711 |
| 21 | 4327559 |
| 22 | 7011070 |
| 23 | 11354229 |
| 24 | 18382849 |
| 25 | 29756734 |
| 26 | 48161507 |
| 27 | 77942601 |
| 28 | 126131078 |
| 29 | 204103439 |
| 30 | 330267253 |
| 31 | 534406596 |
| 32 | 864714241 |
[1,4,35,129,374,839,1717,3276,5983,10579,18278, 31041,52049,86450,142579,233925,382318,623083, 1013381,1645704,2669711,4327559,7011070,11354229, 18382849,29756734,48161507,77942601,126131078, 204103439,330267253,534406596,864714241] |