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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 14 |
| 3 | 38 |
| 4 | 102 |
| 5 | 271 |
| 6 | 714 |
| 7 | 1868 |
| 8 | 4858 |
| 9 | 12569 |
| 10 | 32374 |
| 11 | 83058 |
| 12 | 212350 |
| 13 | 541219 |
| 14 | 1375570 |
| 15 | 3487384 |
| 16 | 8821170 |
| 17 | 22266413 |
| 18 | 56098206 |
| 19 | 141087934 |
| 20 | 354268502 |
| 21 | 888238903 |
| 22 | 2223968666 |
| 23 | 5561234916 |
| 24 | 13889778218 |
| 25 | 34652529473 |
| 26 | 86361653126 |
| 27 | 215021205770 |
| 28 | 534861620718 |
[2,5,14,38,102,271,714,1868,4858,12569,32374, 83058,212350,541219,1375570,3487384,8821170, 22266413,56098206,141087934,354268502,888238903, 2223968666,5561234916,13889778218,34652529473, 86361653126,215021205770,534861620718] |