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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 34 |
| 4 | 601 |
| 5 | 2089 |
| 6 | 37234 |
| 7 | 129466 |
| 8 | 2307889 |
| 9 | 8024785 |
| 10 | 143051866 |
| 11 | 497407186 |
| 12 | 8866907785 |
| 13 | 30831220729 |
| 14 | 549605230786 |
| 15 | 1911038277994 |
| 16 | 34066657400929 |
| 17 | 118453542014881 |
| 18 | 2111583153626794 |
| 19 | 7342208566644610 |
| 20 | 130884088867460281 |
| 21 | 455098477589950921 |
[1,10,34,601,2089,37234,129466,2307889,8024785, 143051866,497407186,8866907785,30831220729, 549605230786,1911038277994,34066657400929, 118453542014881,2111583153626794,7342208566644610, 130884088867460281,455098477589950921] |