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| n | a(n) |
|---|---|
| 1 | 74 |
| 2 | 250 |
| 3 | 1730 |
| 4 | 10118 |
| 5 | 64290 |
| 6 | 399122 |
| 7 | 2523098 |
| 8 | 15907690 |
| 9 | 100603770 |
| 10 | 636270550 |
| 11 | 4026503762 |
| 12 | 25483526018 |
| 13 | 161305309394 |
| 14 | 1021070935782 |
| 15 | 6463641254302 |
| 16 | 40917054779762 |
| 17 | 259021102980902 |
| 18 | 1639712263959994 |
| 19 | 10380090197352550 |
[74,250,1730,10118,64290,399122,2523098,15907690, 100603770,636270550,4026503762,25483526018, 161305309394,1021070935782,6463641254302, 40917054779762,259021102980902,1639712263959994, 10380090197352550] |