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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 12 |
| 4 | 30 |
| 5 | 124 |
| 6 | 418 |
| 7 | 1274 |
| 8 | 2512 |
| 9 | 3526 |
| 10 | 4618 |
| 11 | 7432 |
| 12 | 12778 |
| 13 | 26098 |
| 14 | 34192 |
| 15 | 37768 |
| 16 | 59914 |
| 17 | 88786 |
| 18 | 97768 |
| 19 | 112558 |
| 20 | 221942 |
| 21 | 237544 |
| 22 | 485326 |
| 23 | 642358 |
| 24 | 686638 |
| 25 | 1042078 |
| 26 | 1172918 |
| 27 | 2041402 |
| 28 | 2406448 |
| 29 | 4288574 |
| 30 | 4938848 |
| 31 | 9292156 |
| 32 | 14341888 |
| 33 | 17726098 |
| 34 | 20757292 |
| 35 | 32507242 |
[4,6,12,30,124,418,1274,2512,3526,4618,7432,12778, 26098,34192,37768,59914,88786,97768,112558,221942, 237544,485326,642358,686638,1042078,1172918, 2041402,2406448,4288574,4938848,9292156,14341888, 17726098,20757292,32507242] |