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| n | a(n) |
|---|---|
| 1 | 1260 |
| 2 | 7922 |
| 3 | 37160 |
| 4 | 85808 |
| 5 | 518498 |
| 6 | 2489352 |
| 7 | 5767680 |
| 8 | 34496526 |
| 9 | 165959340 |
| 10 | 384876232 |
| 11 | 2298587370 |
| 12 | 11061103280 |
| 13 | 25655550076 |
| 14 | 153191338398 |
| 15 | 737201742464 |
| 16 | 1709930351560 |
| 17 | 10209850851410 |
| 18 | 49133026339596 |
| 19 | 113963788270572 |
[1260,7922,37160,85808,518498,2489352,5767680, 34496526,165959340,384876232,2298587370, 11061103280,25655550076,153191338398,737201742464, 1709930351560,10209850851410,49133026339596, 113963788270572] |