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A021754 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 17 |
| 2 | 190 |
| 3 | 1770 |
| 4 | 14931 |
| 5 | 118587 |
| 6 | 905920 |
| 7 | 6742340 |
| 8 | 49288261 |
| 9 | 355826757 |
| 10 | 2546230050 |
| 11 | 18106416510 |
| 12 | 128181315991 |
| 13 | 904540692527 |
| 14 | 6368500164580 |
| 15 | 44764509392280 |
| 16 | 314282333570121 |
| 17 | 2204653080603897 |
| 18 | 15456046918261510 |
| 19 | 108310071701877650 |
| 20 | 758760684298882651 |
[1,17,190,1770,14931,118587,905920,6742340, 49288261,355826757,2546230050,18106416510, 128181315991,904540692527,6368500164580, 44764509392280,314282333570121,2204653080603897, 15456046918261510,108310071701877650, 758760684298882651] |