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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 21 |
| 5 | 91 |
| 6 | 120 |
| 7 | 300 |
| 8 | 990 |
| 9 | 2080 |
| 10 | 8911 |
| 11 | 11781 |
| 12 | 29403 |
| 13 | 97020 |
| 14 | 203841 |
| 15 | 873181 |
| 16 | 1154440 |
| 17 | 2881200 |
| 18 | 9506980 |
| 19 | 19974360 |
| 20 | 85562821 |
| 21 | 113123361 |
| 22 | 282328203 |
| 23 | 931587030 |
| 24 | 1957283461 |
| 25 | 8384283271 |
| 26 | 11084934960 |
| 27 | 27665282700 |
| 28 | 91286021970 |
| 29 | 191793804840 |
| 30 | 821574197731 |
| 31 | 1086210502741 |
| 32 | 2710915376403 |
[1,3,10,21,91,120,300,990,2080,8911,11781,29403, 97020,203841,873181,1154440,2881200,9506980, 19974360,85562821,113123361,282328203,931587030, 1957283461,8384283271,11084934960,27665282700, 91286021970,191793804840,821574197731, 1086210502741,2710915376403] |