The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 17 |
| 6 | 20 |
| 7 | 37 |
| 8 | 353 |
| 9 | 390 |
| 10 | 743 |
| 11 | 10049 |
| 12 | 10792 |
| 13 | 20841 |
| 14 | 365089 |
| 15 | 385930 |
| 16 | 751019 |
| 17 | 16157329 |
| 18 | 16908348 |
| 19 | 33065677 |
| 20 | 843550273 |
| 21 | 876615950 |
| 22 | 1720166223 |
| 23 | 50761436417 |
| 24 | 52481602640 |
| 25 | 103243039057 |
| 26 | 3459501891521 |
| 27 | 3562744930578 |
| 28 | 7022246822099 |
[1,1,2,3,17,20,37,353,390,743,10049,10792,20841, 365089,385930,751019,16157329,16908348,33065677, 843550273,876615950,1720166223,50761436417, 52481602640,103243039057,3459501891521, 3562744930578,7022246822099] |