The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 138 |
| 3 | 293 |
| 4 | 726 |
| 5 | 1649 |
| 6 | 3649 |
| 7 | 8035 |
| 8 | 17751 |
| 9 | 39436 |
| 10 | 88008 |
| 11 | 197077 |
| 12 | 442264 |
| 13 | 993792 |
| 14 | 2234792 |
| 15 | 5027626 |
| 16 | 11313294 |
| 17 | 25460611 |
| 18 | 57302948 |
| 19 | 128973323 |
| 20 | 290288905 |
| 21 | 653378578 |
| 22 | 1470622946 |
| 23 | 3310082320 |
| 24 | 7450351492 |
| 25 | 16769302128 |
| 26 | 37744471436 |
[16,138,293,726,1649,3649,8035,17751,39436,88008, 197077,442264,993792,2234792,5027626,11313294, 25460611,57302948,128973323,290288905,653378578, 1470622946,3310082320,7450351492,16769302128, 37744471436] |