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| n | a(n) |
|---|---|
| 1 | 488 |
| 2 | 2028 |
| 3 | 11581 |
| 4 | 59519 |
| 5 | 306822 |
| 6 | 1472184 |
| 7 | 7426426 |
| 8 | 30066852 |
| 9 | 142944394 |
| 10 | 470066369 |
| 11 | 2057470881 |
| 12 | 5310820947 |
| 13 | 20643033198 |
| 14 | 42416116870 |
| 15 | 143775300377 |
| 16 | 248844171284 |
| 17 | 741261828329 |
| 18 | 1137682147050 |
| 19 | 3032909525755 |
| 20 | 4278092511504 |
[488,2028,11581,59519,306822,1472184,7426426, 30066852,142944394,470066369,2057470881, 5310820947,20643033198,42416116870,143775300377, 248844171284,741261828329,1137682147050, 3032909525755,4278092511504] |