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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 58 |
| 5 | 615 |
| 6 | 7761 |
| 7 | 117628 |
| 8 | 4 |
| 9 | 2151 |
| 10 | 999999955 |
| 11 | 25937424546 |
| 12 | 181398462 |
| 13 | 23298085122403 |
| 14 | 793714773254053 |
| 15 | 29192926025390520 |
| 16 | 3976 |
| 17 | 48661191875666868345 |
| 18 | 5642219814759 |
| 19 | 104127350297911241532670 |
[1,1,6,58,615,7761,117628,4,2151,999999955, 25937424546,181398462,23298085122403, 793714773254053,29192926025390520,3976, 48661191875666868345,5642219814759, 104127350297911241532670] |