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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 23 |
| 5 | 62 |
| 6 | 170 |
| 7 | 441 |
| 8 | 1173 |
| 9 | 3127 |
| 10 | 8266 |
| 11 | 21937 |
| 12 | 58234 |
| 13 | 154390 |
| 14 | 409573 |
| 15 | 1086567 |
| 16 | 2882021 |
| 17 | 7645046 |
| 18 | 20279829 |
| 19 | 53794224 |
| 20 | 142696606 |
| 21 | 378522507 |
| 22 | 1004078871 |
| 23 | 2663452699 |
| 24 | 7065162260 |
| 25 | 18741269167 |
| 26 | 49713692146 |
| 27 | 131872134232 |
| 28 | 349808216915 |
| 29 | 927912454723 |
[1,1,3,10,23,62,170,441,1173,3127,8266,21937, 58234,154390,409573,1086567,2882021,7645046, 20279829,53794224,142696606,378522507,1004078871, 2663452699,7065162260,18741269167,49713692146, 131872134232,349808216915,927912454723] |