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| n | a(n) |
|---|---|
| 0 | 13 |
| 1 | 55 |
| 2 | 277 |
| 3 | 1513 |
| 4 | 8593 |
| 5 | 49825 |
| 6 | 292417 |
| 7 | 1729153 |
| 8 | 10275073 |
| 9 | 61254145 |
| 10 | 365945857 |
| 11 | 2189371393 |
| 12 | 13111037953 |
| 13 | 78565515265 |
| 14 | 470990340097 |
| 15 | 2824331231233 |
| 16 | 16939544543233 |
| 17 | 101611496669185 |
| 18 | 609565899227137 |
| 19 | 3656983075356673 |
| 20 | 21940249178406913 |
| 21 | 131634897988091905 |
| 22 | 789782999624318977 |
[13,55,277,1513,8593,49825,292417,1729153, 10275073,61254145,365945857,2189371393, 13111037953,78565515265,470990340097, 2824331231233,16939544543233,101611496669185, 609565899227137,3656983075356673, 21940249178406913,131634897988091905, 789782999624318977] |