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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 102 |
| 4 | 1160 |
| 5 | 16490 |
| 6 | 281292 |
| 7 | 5598110 |
| 8 | 127326096 |
| 9 | 3257961426 |
| 10 | 92625793940 |
| 11 | 2896747456262 |
| 12 | 98827517418456 |
| 13 | 3652643136982970 |
| 14 | 145385563800940764 |
| 15 | 6200097935648462190 |
| 16 | 282035994269804870432 |
| 17 | 13631368700936950044578 |
| 18 | 697586352315912913754916 |
[1,2,12,102,1160,16490,281292,5598110,127326096, 3257961426,92625793940,2896747456262, 98827517418456,3652643136982970, 145385563800940764,6200097935648462190, 282035994269804870432,13631368700936950044578, 697586352315912913754916] |