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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 160 |
| 4 | 3110 |
| 5 | 67155 |
| 6 | 1548526 |
| 7 | 37346040 |
| 8 | 930513870 |
| 9 | 23765376580 |
| 10 | 618871054120 |
| 11 | 16370119905880 |
| 12 | 438628647940730 |
| 13 | 11880264846822610 |
| 14 | 324739360804852980 |
| 15 | 8946782070689651280 |
| 16 | 248184394985913218910 |
| 17 | 6926162613387923126700 |
| 18 | 194320992885495965332600 |
| 19 | 5477763483026946993808960 |
| 20 | 155070883903415687652796120 |
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