The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 448 |
| 4 | 4655 |
| 5 | 76092 |
| 6 | 30490 |
| 7 | 80075 |
| 8 | 430302 |
| 9 | 2285047 |
| 10 | 6078768 |
| 11 | 20376032 |
| 12 | 13303523 |
| 13 | 21208739 |
| 14 | 49734303 |
| 15 | 131517548 |
| 16 | 249598727 |
| 17 | 540742895 |
| 18 | 404616118 |
| 19 | 549711709 |
| 20 | 983715865 |
| 21 | 1910489463 |
| 22 | 3070327312 |
[448,4655,76092,30490,80075,430302,2285047, 6078768,20376032,13303523,21208739,49734303, 131517548,249598727,540742895,404616118,549711709, 983715865,1910489463,3070327312] |