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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 17 |
| 3 | 24 |
| 4 | 60 |
| 5 | 133 |
| 6 | 283 |
| 7 | 634 |
| 8 | 1419 |
| 9 | 3092 |
| 10 | 6849 |
| 11 | 15213 |
| 12 | 33509 |
| 13 | 74017 |
| 14 | 163898 |
| 15 | 361980 |
| 16 | 799660 |
| 17 | 1768383 |
| 18 | 3908128 |
| 19 | 8635736 |
| 20 | 19089245 |
| 21 | 42191413 |
| 22 | 93242838 |
| 23 | 206088583 |
| 24 | 455499706 |
| 25 | 1006707139 |
| 26 | 2224999897 |
| 27 | 4917670483 |
| 28 | 10868814633 |
| 29 | 24021891696 |
[4,17,24,60,133,283,634,1419,3092,6849,15213, 33509,74017,163898,361980,799660,1768383,3908128, 8635736,19089245,42191413,93242838,206088583, 455499706,1006707139,2224999897,4917670483, 10868814633,24021891696] |