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| n | a(n) |
|---|---|
| 1 | 211 |
| 2 | 669 |
| 3 | 2111 |
| 4 | 7995 |
| 5 | 29673 |
| 6 | 117703 |
| 7 | 462885 |
| 8 | 1868937 |
| 9 | 7534429 |
| 10 | 30744153 |
| 11 | 125576911 |
| 12 | 516317755 |
| 13 | 2126269431 |
| 14 | 8792513827 |
| 15 | 36414484091 |
| 16 | 151240645827 |
| 17 | 628964493529 |
| 18 | 2621050705595 |
| 19 | 10934020192599 |
| 20 | 45682050849053 |
[211,669,2111,7995,29673,117703,462885,1868937, 7534429,30744153,125576911,516317755,2126269431, 8792513827,36414484091,151240645827,628964493529, 2621050705595,10934020192599,45682050849053] |