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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 90 |
| 2 | 1274 |
| 3 | 8568 |
| 4 | 38115 |
| 5 | 130130 |
| 6 | 369460 |
| 7 | 915552 |
| 8 | 2043621 |
| 9 | 4198810 |
| 10 | 8065134 |
| 11 | 14651000 |
| 12 | 25393095 |
| 13 | 42280434 |
| 14 | 68000360 |
| 15 | 106108288 |
| 16 | 161222985 |
| 17 | 239249178 |
| 18 | 347629282 |
| 19 | 495626040 |
| 20 | 694637867 |
| 21 | 958548690 |
| 22 | 1304114076 |
| 23 | 1751385440 |
| 24 | 2324174125 |
| 25 | 3050557146 |
| 26 | 3963426390 |
[1,90,1274,8568,38115,130130,369460,915552, 2043621,4198810,8065134,14651000,25393095, 42280434,68000360,106108288,161222985,239249178, 347629282,495626040,694637867,958548690, 1304114076,1751385440,2324174125,3050557146, 3963426390] |