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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 39 |
| 3 | 338 |
| 4 | 3075 |
| 5 | 28770 |
| 6 | 274134 |
| 7 | 2645844 |
| 8 | 25781283 |
| 9 | 253068530 |
| 10 | 2498678754 |
| 11 | 24788450076 |
| 12 | 246889978062 |
| 13 | 2467197059124 |
| 14 | 24725226928140 |
| 15 | 248396412496488 |
| 16 | 2500825206700323 |
| 17 | 25225687837101330 |
| 18 | 254877697946626410 |
| 19 | 2579123090162503500 |
| 20 | 26133512970919973850 |
| 21 | 265126176290618366460 |
[1,5,39,338,3075,28770,274134,2645844,25781283, 253068530,2498678754,24788450076,246889978062, 2467197059124,24725226928140,248396412496488, 2500825206700323,25225687837101330, 254877697946626410,2579123090162503500, 26133512970919973850,265126176290618366460] |