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| n | a(n) |
|---|---|
| 3 | 4 |
| 4 | 10 |
| 5 | 74 |
| 6 | 212 |
| 7 | 1856 |
| 8 | 5618 |
| 9 | 53114 |
| 10 | 1630932 |
| 11 | 5161442 |
| 12 | 167427844 |
| 13 | 1729192432 |
| 14 | 5577731626 |
| 15 | 58401766802 |
| 16 | 2005139696964 |
| 17 | 69737304018266 |
| 18 | 228184540445268 |
| 19 | 8043367476888770 |
| 20 | 86866463049858250 |
| 21 | 285815985033409648 |
| 22 | 10225367934387562098 |
| 23 | 111384745483589787826 |
[4,10,74,212,1856,5618,53114,1630932,5161442, 167427844,1729192432,5577731626,58401766802, 2005139696964,69737304018266,228184540445268, 8043367476888770,86866463049858250, 285815985033409648,10225367934387562098, 111384745483589787826] |