The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 802 |
| 2 | 16800 |
| 3 | 299044 |
| 4 | 2888944 |
| 5 | 20952218 |
| 6 | 99817384 |
| 7 | 418454994 |
| 8 | 1385871140 |
| 9 | 4201910020 |
| 10 | 11319995234 |
| 11 | 28417289280 |
| 12 | 65009432892 |
| 13 | 142222105640 |
| 14 | 290405064290 |
| 15 | 573014867750 |
| 16 | 1075969706928 |
| 17 | 1959720585922 |
| 18 | 3431451616020 |
[802,16800,299044,2888944,20952218,99817384, 418454994,1385871140,4201910020,11319995234, 28417289280,65009432892,142222105640,290405064290, 573014867750,1075969706928,1959720585922, 3431451616020] |