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| n | a(n) |
|---|---|
| 0 | 19 |
| 1 | 20 |
| 2 | 79 |
| 3 | 178 |
| 4 | 435 |
| 5 | 613 |
| 6 | 1048 |
| 7 | 2709 |
| 8 | 52519 |
| 9 | 107747 |
| 10 | 160266 |
| 11 | 268013 |
| 12 | 696292 |
| 13 | 1660597 |
| 14 | 5678083 |
| 15 | 7338680 |
| 16 | 284547923 |
| 17 | 291886603 |
| 18 | 1160207732 |
| 19 | 2612302067 |
| 20 | 6384811866 |
| 21 | 8997113933 |
| 22 | 15381925799 |
| 23 | 39760965531 |
[19,20,79,178,435,613,1048,2709,52519,107747, 160266,268013,696292,1660597,5678083,7338680, 284547923,291886603,1160207732,2612302067, 6384811866,8997113933,15381925799,39760965531] |