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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 26 |
| 3 | 92 |
| 4 | 354 |
| 5 | 1387 |
| 6 | 5470 |
| 7 | 21484 |
| 8 | 84425 |
| 9 | 331838 |
| 10 | 1304618 |
| 11 | 5128566 |
| 12 | 20161270 |
| 13 | 79257643 |
| 14 | 311578924 |
| 15 | 1224880378 |
| 16 | 4815257718 |
| 17 | 18929769479 |
| 18 | 74416841347 |
| 19 | 292547978257 |
| 20 | 1150066574420 |
| 21 | 4521149390460 |
| 22 | 17773572810348 |
| 23 | 69871588449166 |
[4,26,92,354,1387,5470,21484,84425,331838,1304618, 5128566,20161270,79257643,311578924,1224880378, 4815257718,18929769479,74416841347,292547978257, 1150066574420,4521149390460,17773572810348, 69871588449166] |