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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 98 |
| 3 | 455 |
| 4 | 1213 |
| 5 | 3328 |
| 6 | 7140 |
| 7 | 15446 |
| 8 | 28023 |
| 9 | 51356 |
| 10 | 85228 |
| 11 | 141665 |
| 12 | 217763 |
| 13 | 335496 |
| 14 | 489964 |
| 15 | 716380 |
| 16 | 1000977 |
| 17 | 1400376 |
| 18 | 1894984 |
| 19 | 2565347 |
| 20 | 3373769 |
| 21 | 4439204 |
| 22 | 5709980 |
| 23 | 7346722 |
| 24 | 9262315 |
| 25 | 11681488 |
| 26 | 14491782 |
| 27 | 17981005 |
| 28 | 21979651 |
| 29 | 26872568 |
| 30 | 32446832 |
[20,98,455,1213,3328,7140,15446,28023,51356,85228, 141665,217763,335496,489964,716380,1000977, 1400376,1894984,2565347,3373769,4439204,5709980, 7346722,9262315,11681488,14491782,17981005, 21979651,26872568,32446832] |