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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 37 |
| 4 | 316 |
| 5 | 4545 |
| 6 | 108226 |
| 7 | 3843541 |
| 8 | 187799592 |
| 9 | 12013365601 |
| 10 | 973014552190 |
| 11 | 97300597043301 |
| 12 | 11773360632193876 |
| 13 | 1695363763070006497 |
| 14 | 286516473369031084986 |
| 15 | 56157228737911538160085 |
| 16 | 12635376465294288199302976 |
| 17 | 3234656375101858631647453761 |
| 18 | 934815692404177059563237280502 |
[1,6,37,316,4545,108226,3843541,187799592, 12013365601,973014552190,97300597043301, 11773360632193876,1695363763070006497, 286516473369031084986,56157228737911538160085, 12635376465294288199302976, 3234656375101858631647453761, 934815692404177059563237280502] |