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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 43 |
| 4 | 183 |
| 5 | 797 |
| 6 | 3574 |
| 7 | 16223 |
| 8 | 74919 |
| 9 | 348413 |
| 10 | 1636926 |
| 11 | 7728125 |
| 12 | 36735049 |
| 13 | 175206264 |
| 14 | 839653986 |
| 15 | 4034201277 |
| 16 | 19450853963 |
| 17 | 93965830417 |
| 18 | 455155856199 |
| 19 | 2208144191025 |
| 20 | 10734880227452 |
| 21 | 52253712398104 |
| 22 | 254775237149807 |
| 23 | 1243519514802906 |
| 24 | 6077610959396950 |
| 25 | 29730078108932190 |
| 26 | 145593549939873856 |
[1,3,11,43,183,797,3574,16223,74919,348413, 1636926,7728125,36735049,175206264,839653986, 4034201277,19450853963,93965830417,455155856199, 2208144191025,10734880227452,52253712398104, 254775237149807,1243519514802906,6077610959396950, 29730078108932190,145593549939873856] |