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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 546 |
| 3 | 3372 |
| 4 | 13500 |
| 5 | 41670 |
| 6 | 107502 |
| 7 | 243576 |
| 8 | 499992 |
| 9 | 949890 |
| 10 | 1695450 |
| 11 | 2874852 |
| 12 | 4669716 |
| 13 | 7313502 |
| 14 | 11100390 |
| 15 | 16395120 |
| 16 | 23643312 |
| 17 | 33382746 |
| 18 | 46255122 |
| 19 | 63018780 |
| 20 | 84561900 |
| 21 | 111916662 |
| 22 | 146273886 |
| 23 | 188998632 |
| 24 | 241646280 |
| 25 | 305979570 |
| 26 | 383986122 |
[42,546,3372,13500,41670,107502,243576,499992, 949890,1695450,2874852,4669716,7313502,11100390, 16395120,23643312,33382746,46255122,63018780, 84561900,111916662,146273886,188998632,241646280, 305979570,383986122] |