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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 3 |
| 3 | 6 |
| 4 | 11 |
| 5 | 26 |
| 6 | 52 |
| 7 | 124 |
| 8 | 275 |
| 9 | 648 |
| 10 | 1511 |
| 11 | 3618 |
| 12 | 8635 |
| 13 | 20920 |
| 14 | 50758 |
| 15 | 124114 |
| 16 | 304425 |
| 17 | 750330 |
| 18 | 1854716 |
| 19 | 4600692 |
| 20 | 11441298 |
| 21 | 28528484 |
| 22 | 71290791 |
| 23 | 178529666 |
| 24 | 447914775 |
| 25 | 1125756830 |
| 26 | 2833896220 |
| 27 | 7144466184 |
| 28 | 18036398490 |
| 29 | 45591671450 |
| 30 | 115381759707 |
| 31 | 292329164908 |
| 32 | 741410952975 |
| 33 | 1882219946418 |
| 34 | 4782782372655 |
| 35 | 12163730636096 |
[4,3,6,11,26,52,124,275,648,1511,3618,8635,20920, 50758,124114,304425,750330,1854716,4600692, 11441298,28528484,71290791,178529666,447914775, 1125756830,2833896220,7144466184,18036398490, 45591671450,115381759707,292329164908, 741410952975,1882219946418,4782782372655, 12163730636096] |