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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 20 |
| 3 | 918 |
| 4 | 80032 |
| 5 | 12042925 |
| 6 | 2930093028 |
| 7 | 1091180685420 |
| 8 | 593430683068672 |
| 9 | 453081063936151719 |
| 10 | 469964400518950271900 |
| 11 | 644367335619103754943450 |
| 12 | 1141157288474505534959353440 |
| 13 | 2559472926372019471694595185328 |
| 14 | 7148083254588411836230809315647744 |
| 15 | 24494543545202626717977721555958466300 |
| 16 | 101668844348061438731562868186881235350528 |
[1,1,20,918,80032,12042925,2930093028, 1091180685420,593430683068672,453081063936151719, 469964400518950271900,644367335619103754943450, 1141157288474505534959353440, 2559472926372019471694595185328, 7148083254588411836230809315647744, 24494543545202626717977721555958466300, 101668844348061438731562868186881235350528] |