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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 13 |
| 3 | 20 |
| 4 | 44 |
| 5 | 123 |
| 6 | 343 |
| 7 | 957 |
| 8 | 2710 |
| 9 | 7749 |
| 10 | 22170 |
| 11 | 63434 |
| 12 | 181941 |
| 13 | 521609 |
| 14 | 1495695 |
| 15 | 4290128 |
| 16 | 12304541 |
| 17 | 35291808 |
| 18 | 101228002 |
| 19 | 290349737 |
| 20 | 832808429 |
| 21 | 2388749945 |
| 22 | 6851656946 |
| 23 | 19652642153 |
| 24 | 56369797674 |
| 25 | 161685824712 |
| 26 | 463764471339 |
[4,13,20,44,123,343,957,2710,7749,22170,63434, 181941,521609,1495695,4290128,12304541,35291808, 101228002,290349737,832808429,2388749945, 6851656946,19652642153,56369797674,161685824712, 463764471339] |