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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 26 |
| 2 | 214 |
| 3 | 1806 |
| 4 | 15374 |
| 5 | 131538 |
| 6 | 1128990 |
| 7 | 9710910 |
| 8 | 83652388 |
| 9 | 721363974 |
| 10 | 6225222156 |
| 11 | 53750847042 |
| 12 | 464278918952 |
| 13 | 4011329573242 |
| 14 | 34664086928592 |
| 15 | 299591386800116 |
| 16 | 2589524785835700 |
| 17 | 22384118655449566 |
| 18 | 193499832018326518 |
[1,26,214,1806,15374,131538,1128990,9710910, 83652388,721363974,6225222156,53750847042, 464278918952,4011329573242,34664086928592, 299591386800116,2589524785835700, 22384118655449566,193499832018326518] |