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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 47 |
| 5 | 159 |
| 6 | 579 |
| 7 | 2119 |
| 8 | 8299 |
| 9 | 32155 |
| 10 | 129903 |
| 11 | 521605 |
| 12 | 2168721 |
| 13 | 8937214 |
| 14 | 37854276 |
| 15 | 159143916 |
| 16 | 684442662 |
| 17 | 2922266602 |
| 18 | 12717021946 |
| 19 | 54977669121 |
| 20 | 241582801230 |
| 21 | 1055137305760 |
| 22 | 4673859417364 |
| 23 | 20588950910056 |
| 24 | 91821057325252 |
| 25 | 407425574625565 |
| 26 | 1827561724401272 |
| 27 | 8159821495926284 |
[1,2,5,14,47,159,579,2119,8299,32155,129903, 521605,2168721,8937214,37854276,159143916, 684442662,2922266602,12717021946,54977669121, 241582801230,1055137305760,4673859417364, 20588950910056,91821057325252,407425574625565, 1827561724401272,8159821495926284] |