The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 10 |
| 4 | 23 |
| 5 | 49 |
| 6 | 98 |
| 7 | 209 |
| 8 | 431 |
| 9 | 898 |
| 10 | 1871 |
| 11 | 3889 |
| 12 | 8098 |
| 13 | 16849 |
| 14 | 35063 |
| 15 | 72970 |
| 16 | 151847 |
| 17 | 316001 |
| 18 | 657602 |
| 19 | 1368481 |
| 20 | 2847839 |
| 21 | 5926402 |
| 22 | 12332959 |
| 23 | 25665121 |
| 24 | 53409602 |
| 25 | 111146401 |
| 26 | 231297767 |
| 27 | 481335050 |
| 28 | 1001667383 |
| 29 | 2084488849 |
| 30 | 4337860898 |
[1,7,10,23,49,98,209,431,898,1871,3889,8098,16849, 35063,72970,151847,316001,657602,1368481,2847839, 5926402,12332959,25665121,53409602,111146401, 231297767,481335050,1001667383,2084488849, 4337860898] |