The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 27 |
| 3 | 429 |
| 4 | 1353 |
| 5 | 1863 |
| 6 | 3388 |
| 7 | 3591 |
| 8 | 7119 |
| 9 | 78403 |
| 10 | 133533 |
| 11 | 178623 |
| 12 | 2282148 |
| 13 | 2732353 |
| 14 | 3882813 |
| 15 | 7103835 |
| 16 | 13335333 |
| 17 | 17016076 |
| 18 | 17786223 |
| 19 | 27377889 |
| 20 | 32738728 |
| 21 | 35639163 |
| 22 | 308725039 |
| 23 | 347826603 |
| 24 | 1248851513 |
| 25 | 1333353333 |
| 26 | 1420855168 |
| 27 | 1777862223 |
| 28 | 3146385338 |
| 29 | 3699393633 |
[15,27,429,1353,1863,3388,3591,7119,78403,133533, 178623,2282148,2732353,3882813,7103835,13335333, 17016076,17786223,27377889,32738728,35639163, 308725039,347826603,1248851513,1333353333, 1420855168,1777862223,3146385338,3699393633] |