The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 680 |
| 3 | 29260 |
| 4 | 34220 |
| 5 | 70300 |
| 6 | 221815 |
| 7 | 227920 |
| 8 | 287980 |
| 9 | 467180 |
| 10 | 908600 |
| 11 | 2481115 |
| 12 | 4278680 |
| 13 | 12259940 |
| 14 | 13813570 |
| 15 | 15493204 |
| 16 | 17861900 |
| 17 | 19970444 |
| 18 | 24672560 |
| 19 | 25665020 |
| 20 | 27880600 |
| 21 | 29742164 |
| 22 | 34055980 |
| 23 | 44722580 |
[20,680,29260,34220,70300,221815,227920,287980, 467180,908600,2481115,4278680,12259940,13813570, 15493204,17861900,19970444,24672560,25665020, 27880600,29742164,34055980,44722580] |