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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 163 |
| 5 | 698 |
| 6 | 3070 |
| 7 | 13816 |
| 8 | 63018 |
| 9 | 290454 |
| 10 | 1351773 |
| 11 | 6339159 |
| 12 | 29904498 |
| 13 | 141807235 |
| 14 | 675482905 |
| 15 | 3229778815 |
| 16 | 15493756268 |
| 17 | 74541916820 |
| 18 | 359542527108 |
| 19 | 1738111831011 |
| 20 | 8419375695658 |
| 21 | 40856978894108 |
| 22 | 198590179087079 |
| 23 | 966691127754828 |
| 24 | 4711921749598645 |
| 25 | 22995200956892561 |
| 26 | 112346622456221790 |
[1,3,10,39,163,698,3070,13816,63018,290454, 1351773,6339159,29904498,141807235,675482905, 3229778815,15493756268,74541916820,359542527108, 1738111831011,8419375695658,40856978894108, 198590179087079,966691127754828,4711921749598645, 22995200956892561,112346622456221790] |