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A089677 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 37 |
| 5 | 271 |
| 6 | 2341 |
| 7 | 23647 |
| 8 | 272917 |
| 9 | 3543631 |
| 10 | 51123781 |
| 11 | 811316287 |
| 12 | 14045783797 |
| 13 | 263429174191 |
| 14 | 5320671485221 |
| 15 | 115141595488927 |
| 16 | 2657827340990677 |
| 17 | 65185383514567951 |
| 18 | 1692767331628422661 |
| 19 | 46400793659664205567 |
| 20 | 1338843898122192101557 |
[0,1,1,7,37,271,2341,23647,272917,3543631, 51123781,811316287,14045783797,263429174191, 5320671485221,115141595488927,2657827340990677, 65185383514567951,1692767331628422661, 46400793659664205567,1338843898122192101557] |