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A212408 as a simple table
| n | a(n) |
|---|---|
| 1 | 55 |
| 2 | 285 |
| 3 | 1314 |
| 4 | 5769 |
| 5 | 24322 |
| 6 | 100736 |
| 7 | 413220 |
| 8 | 1685039 |
| 9 | 6844362 |
| 10 | 27724036 |
| 11 | 112072540 |
| 12 | 452348578 |
| 13 | 1823583124 |
| 14 | 7344493104 |
| 15 | 29556979016 |
| 16 | 118871913787 |
| 17 | 477820811258 |
| 18 | 1919788147772 |
| 19 | 7710323488748 |
| 20 | 30956089143902 |
| 21 | 124248950086268 |
[55,285,1314,5769,24322,100736,413220,1685039, 6844362,27724036,112072540,452348578,1823583124, 7344493104,29556979016,118871913787,477820811258, 1919788147772,7710323488748,30956089143902, 124248950086268] |