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| n | a(n) |
|---|---|
| 1 | 11 |
| 2 | 56 |
| 3 | 187 |
| 4 | 574 |
| 5 | 1783 |
| 6 | 5657 |
| 7 | 18408 |
| 8 | 61140 |
| 9 | 205390 |
| 10 | 694018 |
| 11 | 2350061 |
| 12 | 7961090 |
| 13 | 26964678 |
| 14 | 91303265 |
| 15 | 309082754 |
| 16 | 1046163241 |
| 17 | 3540718751 |
| 18 | 11983122960 |
| 19 | 40555030532 |
| 20 | 137252283821 |
| 21 | 464510611475 |
| 22 | 1572073476421 |
| 23 | 5320479934245 |
[11,56,187,574,1783,5657,18408,61140,205390, 694018,2350061,7961090,26964678,91303265, 309082754,1046163241,3540718751,11983122960, 40555030532,137252283821,464510611475, 1572073476421,5320479934245] |