The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 47 |
| 4 | 475 |
| 5 | 5857 |
| 6 | 85582 |
| 7 | 1442814 |
| 8 | 27569010 |
| 9 | 588533169 |
| 10 | 13880832378 |
| 11 | 358407441163 |
| 12 | 10054835359411 |
| 13 | 304540419456509 |
| 14 | 9904454527313548 |
| 15 | 344267509478109266 |
| 16 | 12736907296570957669 |
| 17 | 499767123093151036603 |
| 18 | 20730741476220960428814 |
| 19 | 906482220845570488188348 |
| 20 | 41675291255765161672107867 |
[1,1,6,47,475,5857,85582,1442814,27569010, 588533169,13880832378,358407441163,10054835359411, 304540419456509,9904454527313548, 344267509478109266,12736907296570957669, 499767123093151036603,20730741476220960428814, 906482220845570488188348, 41675291255765161672107867] |