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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1120 |
| 2 | 8247 |
| 3 | 34892 |
| 4 | 110880 |
| 5 | 293505 |
| 6 | 682787 |
| 7 | 1441440 |
| 8 | 2820208 |
| 9 | 5189184 |
| 10 | 9075733 |
| 11 | 15209677 |
| 12 | 24576340 |
| 13 | 38478109 |
| 14 | 58605120 |
| 15 | 87115718 |
| 16 | 126727310 |
| 17 | 180818236 |
| 18 | 253541302 |
| 19 | 349949600 |
| 20 | 476135234 |
| 21 | 639381600 |
| 22 | 848329835 |
[0,1120,8247,34892,110880,293505,682787,1441440, 2820208,5189184,9075733,15209677,24576340, 38478109,58605120,87115718,126727310,180818236, 253541302,349949600,476135234,639381600,848329835] |