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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 7 |
| 4 | 43 |
| 5 | 76 |
| 6 | 469 |
| 7 | 829 |
| 8 | 5116 |
| 9 | 9043 |
| 10 | 55807 |
| 11 | 98644 |
| 12 | 608761 |
| 13 | 1076041 |
| 14 | 6640564 |
| 15 | 11737807 |
| 16 | 72437443 |
| 17 | 128039836 |
| 18 | 790171309 |
| 19 | 1396700389 |
| 20 | 8619446956 |
| 21 | 15235664443 |
| 22 | 94023745207 |
| 23 | 166195608484 |
| 24 | 1025641750321 |
| 25 | 1812916028881 |
| 26 | 11188035508324 |
| 27 | 19775880709207 |
[1,4,7,43,76,469,829,5116,9043,55807,98644,608761, 1076041,6640564,11737807,72437443,128039836, 790171309,1396700389,8619446956,15235664443, 94023745207,166195608484,1025641750321, 1812916028881,11188035508324,19775880709207] |