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A221410 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 160 |
| 5 | 2209 |
| 6 | 44081 |
| 7 | 1247278 |
| 8 | 50003383 |
| 9 | 2843143785 |
| 10 | 229717311597 |
| 11 | 26423288336013 |
| 12 | 4331881870569310 |
| 13 | 1013060852125392519 |
| 14 | 338180578288458076194 |
| 15 | 161225876602752196310870 |
| 16 | 109821236456762132613619651 |
| 17 | 106923122485613725232770276036 |
[1,1,3,17,160,2209,44081,1247278,50003383, 2843143785,229717311597,26423288336013, 4331881870569310,1013060852125392519, 338180578288458076194,161225876602752196310870, 109821236456762132613619651, 106923122485613725232770276036] |