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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 74 |
| 4 | 1407 |
| 5 | 36357 |
| 6 | 1190476 |
| 7 | 47254783 |
| 8 | 2205546706 |
| 9 | 118378505742 |
| 10 | 7184030384361 |
| 11 | 486440226752911 |
| 12 | 36358328607088010 |
| 13 | 2973464028723984551 |
| 14 | 264119772408892921774 |
| 15 | 25321946948812001539166 |
| 16 | 2606224408648404660237647 |
| 17 | 286624141573198517220290837 |
[1,1,6,74,1407,36357,1190476,47254783,2205546706, 118378505742,7184030384361,486440226752911, 36358328607088010,2973464028723984551, 264119772408892921774,25321946948812001539166, 2606224408648404660237647, 286624141573198517220290837] |