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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 42 |
| 5 | 90 |
| 6 | 213 |
| 7 | 527 |
| 8 | 1326 |
| 9 | 3317 |
| 10 | 8022 |
| 11 | 19608 |
| 12 | 48272 |
| 13 | 119073 |
| 14 | 293109 |
| 15 | 719074 |
| 16 | 1766201 |
| 17 | 4342666 |
| 18 | 10679582 |
| 19 | 26253546 |
| 20 | 64516501 |
| 21 | 158569355 |
| 22 | 389788182 |
| 23 | 958172417 |
| 24 | 2355231458 |
| 25 | 5789058028 |
| 26 | 14229546200 |
| 27 | 34976963777 |
| 28 | 85975197161 |
| 29 | 211329783890 |
| 30 | 519453451997 |
[1,2,5,14,42,90,213,527,1326,3317,8022,19608, 48272,119073,293109,719074,1766201,4342666, 10679582,26253546,64516501,158569355,389788182, 958172417,2355231458,5789058028,14229546200, 34976963777,85975197161,211329783890,519453451997] |