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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 21 |
| 2 | 4095 |
| 3 | 794430 |
| 4 | 154115346 |
| 5 | 29897582715 |
| 6 | 5799976931385 |
| 7 | 1125165627105996 |
| 8 | 218276331681631860 |
| 9 | 42344483180609474865 |
| 10 | 8214611460706556491971 |
| 11 | 1593592278893891349967530 |
| 12 | 309148687493954215337208870 |
| 13 | 59973251781548223884068553271 |
[0,21,4095,794430,154115346,29897582715, 5799976931385,1125165627105996,218276331681631860, 42344483180609474865,8214611460706556491971, 1593592278893891349967530, 309148687493954215337208870, 59973251781548223884068553271] |