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| n | a(n) |
|---|---|
| 1 | 84 |
| 2 | 1908 |
| 3 | 74850 |
| 4 | 806344 |
| 5 | 19324668 |
| 6 | 62374858 |
| 7 | 408913614 |
| 8 | 891388420 |
| 9 | 3398376408 |
| 10 | 17229339930 |
| 11 | 27483954208 |
| 12 | 94862481154 |
| 13 | 194638347078 |
| 14 | 271671521308 |
| 15 | 506393669424 |
| 16 | 1174292792658 |
| 17 | 2487936351660 |
| 18 | 3141898009018 |
| 19 | 6059361174964 |
| 20 | 9093315566088 |
| 21 | 11045325053158 |
[84,1908,74850,806344,19324668,62374858,408913614, 891388420,3398376408,17229339930,27483954208, 94862481154,194638347078,271671521308, 506393669424,1174292792658,2487936351660, 3141898009018,6059361174964,9093315566088, 11045325053158] |