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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 21 |
| 6 | 226 |
| 7 | 2612 |
| 8 | 29261 |
| 9 | 346453 |
| 10 | 4338214 |
| 11 | 57819554 |
| 12 | 815225643 |
| 13 | 12234293579 |
| 14 | 194294281572 |
| 15 | 3264124624256 |
| 16 | 57826690252441 |
| 17 | 1079032037759257 |
| 18 | 21142347350725466 |
| 19 | 434563256137908638 |
| 20 | 9344589765620199919 |
| 21 | 209952915324112384719 |
| 22 | 4919186923210370523448 |
[1,21,226,2612,29261,346453,4338214,57819554, 815225643,12234293579,194294281572,3264124624256, 57826690252441,1079032037759257,21142347350725466, 434563256137908638,9344589765620199919, 209952915324112384719,4919186923210370523448] |