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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 8 |
| 2 | 23 |
| 3 | 47 |
| 4 | 80 |
| 5 | 365 |
| 6 | 3089 |
| 7 | 19916 |
| 8 | 96287 |
| 9 | 369983 |
| 10 | 1188008 |
| 11 | 3489557 |
| 12 | 11440865 |
| 13 | 49588820 |
| 14 | 250207799 |
| 15 | 1210364111 |
| 16 | 5215038272 |
| 17 | 20004134333 |
| 18 | 70879879793 |
| 19 | 248964475292 |
| 20 | 941859229775 |
| 21 | 3946659132575 |
| 22 | 17384730325784 |
| 23 | 75199501505381 |
[2,8,23,47,80,365,3089,19916,96287,369983,1188008, 3489557,11440865,49588820,250207799,1210364111, 5215038272,20004134333,70879879793,248964475292, 941859229775,3946659132575,17384730325784, 75199501505381] |