The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 9 |
| 3 | 22 |
| 4 | 46 |
| 5 | 91 |
| 6 | 183 |
| 7 | 383 |
| 8 | 819 |
| 9 | 1749 |
| 10 | 3699 |
| 11 | 7772 |
| 12 | 16316 |
| 13 | 34325 |
| 14 | 72349 |
| 15 | 152573 |
| 16 | 321621 |
| 17 | 677623 |
| 18 | 1427389 |
| 19 | 3006930 |
| 20 | 6335210 |
| 21 | 13348399 |
| 22 | 28125235 |
| 23 | 59258363 |
| 24 | 124851495 |
| 25 | 263048937 |
| 26 | 554220135 |
| 27 | 1167698552 |
| 28 | 2460253944 |
| 29 | 5183565225 |
| 30 | 10921353721 |
[3,9,22,46,91,183,383,819,1749,3699,7772,16316, 34325,72349,152573,321621,677623,1427389,3006930, 6335210,13348399,28125235,59258363,124851495, 263048937,554220135,1167698552,2460253944, 5183565225,10921353721] |