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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 7 |
| 2 | 16 |
| 3 | 36 |
| 4 | 81 |
| 5 | 182 |
| 6 | 408 |
| 7 | 914 |
| 8 | 2047 |
| 9 | 4584 |
| 10 | 10265 |
| 11 | 22986 |
| 12 | 51471 |
| 13 | 115255 |
| 14 | 258081 |
| 15 | 577899 |
| 16 | 1294040 |
| 17 | 2897633 |
| 18 | 6488421 |
| 19 | 14528964 |
| 20 | 32533461 |
| 21 | 72849384 |
| 22 | 163125366 |
| 23 | 365272615 |
| 24 | 817923579 |
| 25 | 1831505986 |
| 26 | 4101133972 |
| 27 | 9183316890 |
| 28 | 20563412382 |
| 29 | 46045882316 |
| 30 | 103106587509 |
[3,7,16,36,81,182,408,914,2047,4584,10265,22986, 51471,115255,258081,577899,1294040,2897633, 6488421,14528964,32533461,72849384,163125366, 365272615,817923579,1831505986,4101133972, 9183316890,20563412382,46045882316,103106587509] |