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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 103 |
| 5 | 1071 |
| 6 | 16261 |
| 7 | 310543 |
| 8 | 7712433 |
| 9 | 234935473 |
| 10 | 8704118611 |
| 11 | 385999169421 |
| 12 | 20105403167983 |
| 13 | 1220933294124943 |
| 14 | 85391317006742133 |
| 15 | 6817483491016756111 |
| 16 | 617003393602674201721 |
| 17 | 62822626252518811177953 |
| 18 | 7153354574514200634711043 |
| 19 | 905989984031687906166904333 |
[1,1,3,13,103,1071,16261,310543,7712433,234935473, 8704118611,385999169421,20105403167983, 1220933294124943,85391317006742133, 6817483491016756111,617003393602674201721, 62822626252518811177953,7153354574514200634711043, 905989984031687906166904333] |