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A155130 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 48 |
| 3 | 378 |
| 4 | 2982 |
| 5 | 23520 |
| 6 | 185514 |
| 7 | 1463238 |
| 8 | 11541264 |
| 9 | 91031514 |
| 10 | 718009446 |
| 11 | 5663286720 |
| 12 | 44669073162 |
| 13 | 352326519174 |
| 14 | 2778969146352 |
| 15 | 21919069658682 |
| 16 | 172886271635238 |
| 17 | 1363637389057440 |
| 18 | 10755665624848746 |
| 19 | 84835121097343302 |
[1,6,48,378,2982,23520,185514,1463238,11541264, 91031514,718009446,5663286720,44669073162, 352326519174,2778969146352,21919069658682, 172886271635238,1363637389057440, 10755665624848746,84835121097343302] |