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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 46 |
| 3 | 117 |
| 4 | 931 |
| 5 | 3288 |
| 6 | 20706 |
| 7 | 75720 |
| 8 | 384083 |
| 9 | 1662512 |
| 10 | 8212668 |
| 11 | 37172701 |
| 12 | 176457313 |
| 13 | 803299589 |
| 14 | 3768617073 |
| 15 | 17355787464 |
| 16 | 81234030372 |
| 17 | 376860933270 |
| 18 | 1753580102111 |
| 19 | 8135995110263 |
| 20 | 37838340282830 |
| 21 | 175764796211917 |
| 22 | 817275191103917 |
[3,46,117,931,3288,20706,75720,384083,1662512, 8212668,37172701,176457313,803299589,3768617073, 17355787464,81234030372,376860933270, 1753580102111,8135995110263,37838340282830, 175764796211917,817275191103917] |