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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 14 |
| 3 | 37 |
| 4 | 97 |
| 5 | 254 |
| 6 | 665 |
| 7 | 1741 |
| 8 | 4558 |
| 9 | 11933 |
| 10 | 31241 |
| 11 | 81790 |
| 12 | 214129 |
| 13 | 560597 |
| 14 | 1467662 |
| 15 | 3842389 |
| 16 | 10059505 |
| 17 | 26336126 |
| 18 | 68948873 |
| 19 | 180510493 |
| 20 | 472582606 |
| 21 | 1237237325 |
| 22 | 3239129369 |
| 23 | 8480150782 |
| 24 | 22201322977 |
| 25 | 58123818149 |
| 26 | 152170131470 |
| 27 | 398386576261 |
| 28 | 1042989597313 |
[1,5,14,37,97,254,665,1741,4558,11933,31241,81790, 214129,560597,1467662,3842389,10059505,26336126, 68948873,180510493,472582606,1237237325, 3239129369,8480150782,22201322977,58123818149, 152170131470,398386576261,1042989597313] |