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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 11 |
| 2 | 63 |
| 3 | 366 |
| 4 | 2132 |
| 5 | 12425 |
| 6 | 72417 |
| 7 | 422076 |
| 8 | 2460038 |
| 9 | 14338151 |
| 10 | 83568867 |
| 11 | 487075050 |
| 12 | 2838881432 |
| 13 | 16546213541 |
| 14 | 96438399813 |
| 15 | 562084185336 |
| 16 | 3276066712202 |
| 17 | 19094316087875 |
| 18 | 111289829815047 |
| 19 | 648644662802406 |
| 20 | 3780578146999388 |
| 21 | 22034824219193921 |
| 22 | 128428367168164137 |
[2,11,63,366,2132,12425,72417,422076,2460038, 14338151,83568867,487075050,2838881432, 16546213541,96438399813,562084185336, 3276066712202,19094316087875,111289829815047, 648644662802406,3780578146999388, 22034824219193921,128428367168164137] |