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| n | a(n) |
|---|---|
| 1 | 48 |
| 2 | 306 |
| 3 | 1264 |
| 4 | 4014 |
| 5 | 11374 |
| 6 | 30422 |
| 7 | 78284 |
| 8 | 199102 |
| 9 | 499810 |
| 10 | 1264496 |
| 11 | 3193024 |
| 12 | 8209318 |
| 13 | 21162622 |
| 14 | 55829010 |
| 15 | 147730098 |
| 16 | 400702654 |
| 17 | 1087655474 |
| 18 | 3024984632 |
| 19 | 8389557884 |
| 20 | 23809669192 |
| 21 | 67140377402 |
| 22 | 193464704214 |
| 23 | 552197517234 |
[48,306,1264,4014,11374,30422,78284,199102,499810, 1264496,3193024,8209318,21162622,55829010, 147730098,400702654,1087655474,3024984632, 8389557884,23809669192,67140377402,193464704214, 552197517234] |