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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 495 |
| 2 | 55055 |
| 3 | 2550548 |
| 4 | 65493792 |
| 5 | 1095915744 |
| 6 | 13232722140 |
| 7 | 123515648685 |
| 8 | 935877829315 |
| 9 | 5967356119725 |
| 10 | 32906870606610 |
| 11 | 160314212254560 |
| 12 | 701733465072640 |
| 13 | 2797750569360384 |
| 14 | 10273887744211872 |
| 15 | 35073296276201118 |
| 16 | 112179553015334805 |
| 17 | 338384405311947995 |
[1,495,55055,2550548,65493792,1095915744, 13232722140,123515648685,935877829315, 5967356119725,32906870606610,160314212254560, 701733465072640,2797750569360384, 10273887744211872,35073296276201118, 112179553015334805,338384405311947995] |