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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 44 |
| 5 | 401 |
| 6 | 4502 |
| 7 | 62217 |
| 8 | 1078184 |
| 9 | 22511377 |
| 10 | 544697162 |
| 11 | 15203286737 |
| 12 | 487623058364 |
| 13 | 17680076670153 |
| 14 | 716428166601422 |
| 15 | 32316840516097417 |
| 16 | 1612716485426095184 |
| 17 | 88351669713816692129 |
| 18 | 5288325124017180531602 |
| 19 | 344527211412891048386337 |
[1,1,2,7,44,401,4502,62217,1078184,22511377, 544697162,15203286737,487623058364,17680076670153, 716428166601422,32316840516097417, 1612716485426095184,88351669713816692129, 5288325124017180531602,344527211412891048386337] |