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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 618 |
| 3 | 10094 |
| 4 | 147203 |
| 5 | 1997037 |
| 6 | 25786636 |
| 7 | 321380188 |
| 8 | 3901566405 |
| 9 | 46429426043 |
| 10 | 544051398254 |
| 11 | 6298258575882 |
| 12 | 72214033934407 |
| 13 | 821632688021449 |
| 14 | 9290501272470672 |
| 15 | 104524684322022776 |
| 16 | 1171184420402768009 |
[1,31,618,10094,147203,1997037,25786636,321380188, 3901566405,46429426043,544051398254,6298258575882, 72214033934407,821632688021449,9290501272470672, 104524684322022776,1171184420402768009] |