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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 252 |
| 3 | 7002 |
| 4 | 284002 |
| 5 | 8956752 |
| 6 | 276285002 |
| 7 | 8039989002 |
| 8 | 226901044252 |
| 9 | 6232521421502 |
| 10 | 167765555015002 |
| 11 | 4441865811412752 |
| 12 | 116042171156004002 |
| 13 | 2998175631045512002 |
| 14 | 76751828260736962252 |
| 15 | 1949598912568702682502 |
| 16 | 49197330547669842130002 |
| 17 | 1234523426440511782592752 |
[1,1,252,7002,284002,8956752,276285002,8039989002, 226901044252,6232521421502,167765555015002, 4441865811412752,116042171156004002, 2998175631045512002,76751828260736962252, 1949598912568702682502,49197330547669842130002, 1234523426440511782592752] |