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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 65 |
| 3 | 379 |
| 4 | 2209 |
| 5 | 12875 |
| 6 | 75041 |
| 7 | 437371 |
| 8 | 2549185 |
| 9 | 14857739 |
| 10 | 86597249 |
| 11 | 504725755 |
| 12 | 2941757281 |
| 13 | 17145817931 |
| 14 | 99933150305 |
| 15 | 582453083899 |
| 16 | 3394785353089 |
| 17 | 19786259034635 |
| 18 | 115322768854721 |
| 19 | 672150354093691 |
| 20 | 3917579355707425 |
| 21 | 22833325780150859 |
[1,11,65,379,2209,12875,75041,437371,2549185, 14857739,86597249,504725755,2941757281, 17145817931,99933150305,582453083899, 3394785353089,19786259034635,115322768854721, 672150354093691,3917579355707425, 22833325780150859] |