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A038155 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 30 |
| 5 | 160 |
| 6 | 975 |
| 7 | 6846 |
| 8 | 54796 |
| 9 | 493200 |
| 10 | 4932045 |
| 11 | 54252550 |
| 12 | 651030666 |
| 13 | 8463398736 |
| 14 | 118487582395 |
| 15 | 1777313736030 |
| 16 | 28437019776600 |
| 17 | 483429336202336 |
| 18 | 8701728051642201 |
| 19 | 165332832981201990 |
| 20 | 3306656659624039990 |
| 21 | 69439789852104840000 |
[0,0,1,6,30,160,975,6846,54796,493200,4932045, 54252550,651030666,8463398736,118487582395, 1777313736030,28437019776600,483429336202336, 8701728051642201,165332832981201990, 3306656659624039990,69439789852104840000] |