The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 89 |
| 3 | 583 |
| 4 | 4163 |
| 5 | 28537 |
| 6 | 197892 |
| 7 | 1369929 |
| 8 | 9480913 |
| 9 | 65635874 |
| 10 | 454328733 |
| 11 | 3144977815 |
| 12 | 21770168425 |
| 13 | 150697387128 |
| 14 | 1043158090187 |
| 15 | 7220949660280 |
| 16 | 49984870462950 |
| 17 | 346005348887302 |
| 18 | 2395118766058622 |
| 19 | 16579494922049801 |
[13,89,583,4163,28537,197892,1369929,9480913, 65635874,454328733,3144977815,21770168425, 150697387128,1043158090187,7220949660280, 49984870462950,346005348887302,2395118766058622, 16579494922049801] |