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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 74801040398884800 |
| 3 | 224403121196654400 |
| 4 | 3066842656354276800 |
| 5 | 6133685312708553600 |
| 6 | 9200527969062830400 |
| 7 | 18401055938125660800 |
| 8 | 131874234223233902400 |
| 9 | 263748468446467804800 |
| 10 | 395622702669701707200 |
| 11 | 791245405339403414400 |
| 12 | 6198089008491993412800 |
| 13 | 12396178016983986825600 |
[2,74801040398884800,224403121196654400, 3066842656354276800,6133685312708553600, 9200527969062830400,18401055938125660800, 131874234223233902400,263748468446467804800, 395622702669701707200,791245405339403414400, 6198089008491993412800,12396178016983986825600] |