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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 17 |
| 5 | 56 |
| 6 | 189 |
| 7 | 673 |
| 8 | 2561 |
| 9 | 10321 |
| 10 | 43612 |
| 11 | 192439 |
| 12 | 884702 |
| 13 | 4227202 |
| 14 | 20942697 |
| 15 | 107363291 |
| 16 | 568547892 |
| 17 | 3105231155 |
| 18 | 17467413871 |
| 19 | 101069173004 |
| 20 | 600841031279 |
| 21 | 3665958252167 |
| 22 | 22933712331957 |
| 23 | 146968161483626 |
| 24 | 963973640814332 |
| 25 | 6466300466801210 |
| 26 | 44327544752355141 |
| 27 | 310325239786656220 |
| 28 | 2217191324979383686 |
| 29 | 16157187739844358535 |
| 30 | 120020165206009363396 |
| 31 | 908305634422244782653 |
| 32 | 6999639387956913535113 |
[1,2,3,6,17,56,189,673,2561,10321,43612,192439, 884702,4227202,20942697,107363291,568547892, 3105231155,17467413871,101069173004,600841031279, 3665958252167,22933712331957,146968161483626, 963973640814332,6466300466801210, 44327544752355141,310325239786656220, 2217191324979383686,16157187739844358535, 120020165206009363396,908305634422244782653, 6999639387956913535113] |