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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 3 |
| 5 | 26 |
| 6 | 29 |
| 7 | 136 |
| 8 | 901 |
| 9 | 36562 |
| 10 | 89893 |
| 11 | 1972460 |
| 12 | 5758715 |
| 13 | 5465775058 |
| 14 | 22687425 |
| 15 | 23740281872 |
| 16 | 97725875584681 |
| 17 | 868245469442 |
| 18 | 27985118605791989 |
| 19 | 73925970047640596 |
| 20 | 858944872773025112243 |
| 21 | 146251429177204071216521962 |
| 22 | 3844747107219467355553841461 |
| 23 | 4817425173757369027231100024 |
[1,1,4,3,26,29,136,901,36562,89893,1972460, 5758715,5465775058,22687425,23740281872, 97725875584681,868245469442,27985118605791989, 73925970047640596,858944872773025112243, 146251429177204071216521962, 3844747107219467355553841461, 4817425173757369027231100024] |