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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 41 |
| 5 | 219 |
| 6 | 1602 |
| 7 | 16635 |
| 8 | 247171 |
| 9 | 5242108 |
| 10 | 157390565 |
| 11 | 6663089873 |
| 12 | 396778864166 |
| 13 | 33200932308437 |
| 14 | 3906922702271961 |
| 15 | 646161881511137940 |
| 16 | 150482521507292513413 |
| 17 | 49318093291540113084965 |
| 18 | 22790150225552744270503692 |
| 19 | 14843990673285561887923674163 |
| 20 | 13646527810852572644275538963207 |
| 21 | 17710656073227095563348293151121448 |
[1,1,3,10,41,219,1602,16635,247171,5242108, 157390565,6663089873,396778864166,33200932308437, 3906922702271961,646161881511137940, 150482521507292513413,49318093291540113084965, 22790150225552744270503692, 14843990673285561887923674163, 13646527810852572644275538963207, 17710656073227095563348293151121448] |