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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 34 |
| 5 | 68 |
| 6 | 144 |
| 7 | 276 |
| 8 | 534 |
| 9 | 974 |
| 10 | 1774 |
| 11 | 3106 |
| 12 | 5410 |
| 13 | 9146 |
| 14 | 15334 |
| 15 | 25158 |
| 16 | 40884 |
| 17 | 65264 |
| 18 | 103204 |
| 19 | 160808 |
| 20 | 248222 |
| 21 | 378350 |
| 22 | 571534 |
| 23 | 853890 |
| 24 | 1264962 |
| 25 | 1855638 |
| 26 | 2700490 |
| 27 | 3895626 |
| 28 | 5577846 |
| 29 | 7923072 |
| 30 | 11176164 |
| 31 | 15650712 |
| 32 | 21774473 |
| 33 | 30092868 |
| 34 | 41337096 |
| 35 | 56434524 |
[1,2,6,14,34,68,144,276,534,974,1774,3106,5410, 9146,15334,25158,40884,65264,103204,160808,248222, 378350,571534,853890,1264962,1855638,2700490, 3895626,5577846,7923072,11176164,15650712, 21774473,30092868,41337096,56434524] |