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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 29 |
| 4 | 329 |
| 5 | 5252 |
| 6 | 110955 |
| 7 | 2972769 |
| 8 | 97922354 |
| 9 | 3872594811 |
| 10 | 180459028989 |
| 11 | 9759149087646 |
| 12 | 604841170643957 |
| 13 | 42508077480226893 |
| 14 | 3357224252026104140 |
| 15 | 295651782273190911233 |
| 16 | 28834727303442640011901 |
| 17 | 3095877335697619795977036 |
| 18 | 363977673792652615285223095 |
[1,1,4,29,329,5252,110955,2972769,97922354, 3872594811,180459028989,9759149087646, 604841170643957,42508077480226893, 3357224252026104140,295651782273190911233, 28834727303442640011901,3095877335697619795977036, 363977673792652615285223095] |