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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 257 |
| 3 | 6819 |
| 4 | 105251 |
| 5 | 2175749 |
| 6 | 44995096 |
| 7 | 796670938 |
| 8 | 13805853214 |
| 9 | 240569119333 |
| 10 | 4044892975196 |
| 11 | 65784204818948 |
| 12 | 1051532586300939 |
| 13 | 16521916387136217 |
| 14 | 254423642953508270 |
| 15 | 3848289482388789293 |
| 16 | 57317953928614093036 |
| 17 | 841172595390506945766 |
| 18 | 12168324212099663732171 |
[1,1,257,6819,105251,2175749,44995096,796670938, 13805853214,240569119333,4044892975196, 65784204818948,1051532586300939,16521916387136217, 254423642953508270,3848289482388789293, 57317953928614093036,841172595390506945766, 12168324212099663732171] |