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| n | a(n) |
|---|---|
| 1 | 154 |
| 2 | 484 |
| 3 | 1689 |
| 4 | 5559 |
| 5 | 18881 |
| 6 | 65202 |
| 7 | 223901 |
| 8 | 772322 |
| 9 | 2674536 |
| 10 | 9246717 |
| 11 | 31958849 |
| 12 | 110567125 |
| 13 | 382593936 |
| 14 | 1323597069 |
| 15 | 4578966412 |
| 16 | 15842082720 |
| 17 | 54811158663 |
| 18 | 189635937913 |
| 19 | 656096229235 |
| 20 | 2269948418864 |
| 21 | 7853573067925 |
| 22 | 27171812792714 |
[154,484,1689,5559,18881,65202,223901,772322, 2674536,9246717,31958849,110567125,382593936, 1323597069,4578966412,15842082720,54811158663, 189635937913,656096229235,2269948418864, 7853573067925,27171812792714] |