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| n | a(n) |
|---|---|
| 1 | 852 |
| 2 | 4702 |
| 3 | 20430 |
| 4 | 43488 |
| 5 | 257064 |
| 6 | 1181875 |
| 7 | 2489352 |
| 8 | 15332220 |
| 9 | 72256060 |
| 10 | 151452208 |
| 11 | 959982508 |
| 12 | 4591052192 |
| 13 | 9592850068 |
| 14 | 61849559376 |
| 15 | 298253419076 |
| 16 | 622061005236 |
| 17 | 4048741759032 |
| 18 | 19611826209636 |
| 19 | 40863715273940 |
| 20 | 267312430484704 |
[852,4702,20430,43488,257064,1181875,2489352, 15332220,72256060,151452208,959982508,4591052192, 9592850068,61849559376,298253419076,622061005236, 4048741759032,19611826209636,40863715273940, 267312430484704] |