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| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 814 |
| 3 | 5567 |
| 4 | 33851 |
| 5 | 184281 |
| 6 | 892122 |
| 7 | 3925717 |
| 8 | 15834473 |
| 9 | 59506551 |
| 10 | 209811804 |
| 11 | 701617754 |
| 12 | 2235893345 |
| 13 | 6840089137 |
| 14 | 20153696074 |
| 15 | 57486754527 |
| 16 | 159114503083 |
| 17 | 428959896263 |
| 18 | 1128320167213 |
| 19 | 2903976632760 |
| 20 | 7322640491124 |
| 21 | 18130800682746 |
[120,814,5567,33851,184281,892122,3925717, 15834473,59506551,209811804,701617754,2235893345, 6840089137,20153696074,57486754527,159114503083, 428959896263,1128320167213,2903976632760, 7322640491124,18130800682746] |