| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 7 |
| 4 | 22 |
| 5 | 43 |
| 6 | 141 |
| 7 | 373 |
| 8 | 1270 |
| 9 | 4053 |
| 10 | 14671 |
| 11 | 52826 |
| 12 | 203289 |
| 13 | 795581 |
| 14 | 3241367 |
| 15 | 13504130 |
| 16 | 57904671 |
| 17 | 253856990 |
| 18 | 1139231977 |
| 19 | 5219113084 |
| 20 | 24401837085 |
| 21 | 116278408069 |
| 22 | 564380686932 |
| 23 | 2787884851040 |
| 24 | 14007277302822 |
| 25 | 71538337097031 |
| 26 | 371197207327709 |
| 27 | 1955833646495247 |
| 28 | 10459788214042492 |
[2,5,7,22,43,141,373,1270,4053,14671,52826,203289, 795581,3241367,13504130,57904671,253856990, 1139231977,5219113084,24401837085,116278408069, 564380686932,2787884851040,14007277302822, 71538337097031,371197207327709,1955833646495247, 10459788214042492] |