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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 20 |
| 3 | 39 |
| 4 | 119 |
| 5 | 224 |
| 6 | 351 |
| 7 | 799 |
| 8 | 879 |
| 9 | 1076 |
| 10 | 1504 |
| 11 | 4064 |
| 12 | 6879 |
| 13 | 7999 |
| 14 | 56847 |
| 15 | 169640 |
| 16 | 346879 |
| 17 | 470975 |
| 18 | 893520 |
| 19 | 1955776 |
| 20 | 7546879 |
| 21 | 17604064 |
| 22 | 36722175 |
| 23 | 79999999 |
| 24 | 95546879 |
| 25 | 222503984 |
| 26 | 580483743 |
| 27 | 584057247 |
| 28 | 626394816 |
| 29 | 7999999999 |
| 30 | 17194139104 |
[3,20,39,119,224,351,799,879,1076,1504,4064,6879, 7999,56847,169640,346879,470975,893520,1955776, 7546879,17604064,36722175,79999999,95546879, 222503984,580483743,584057247,626394816, 7999999999,17194139104] |