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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 16 |
| 4 | 36 |
| 5 | 83 |
| 6 | 151 |
| 7 | 320 |
| 8 | 655 |
| 9 | 1294 |
| 10 | 2357 |
| 11 | 4619 |
| 12 | 8639 |
| 13 | 16844 |
| 14 | 30616 |
| 15 | 56790 |
| 16 | 104812 |
| 17 | 190901 |
| 18 | 355762 |
| 19 | 647964 |
| 20 | 1209236 |
| 21 | 2099298 |
| 22 | 3880726 |
| 23 | 7089589 |
| 24 | 12885826 |
| 25 | 22740746 |
| 26 | 41399828 |
| 27 | 74229365 |
| 28 | 132342905 |
| 29 | 241044147 |
| 30 | 431161540 |
| 31 | 778051684 |
| 32 | 1365541232 |
| 33 | 2454485501 |
[2,5,16,36,83,151,320,655,1294,2357,4619,8639, 16844,30616,56790,104812,190901,355762,647964, 1209236,2099298,3880726,7089589,12885826,22740746, 41399828,74229365,132342905,241044147,431161540, 778051684,1365541232,2454485501] |