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A004338 as a simple table
| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 36 |
| 10 | 780 |
| 11 | 13244 |
| 12 | 194580 |
| 13 | 2598960 |
| 14 | 32468436 |
| 15 | 386206920 |
| 16 | 4426165368 |
| 17 | 49280065120 |
| 18 | 536211932256 |
| 19 | 5727160371180 |
| 20 | 60246643120300 |
| 21 | 625806790696080 |
| 22 | 6431976680401800 |
| 23 | 65516299116620976 |
| 24 | 662252084388541314 |
[1,36,780,13244,194580,2598960,32468436,386206920, 4426165368,49280065120,536211932256,5727160371180, 60246643120300,625806790696080,6431976680401800, 65516299116620976,662252084388541314] |