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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 13 |
| 3 | 465 |
| 4 | 4902 |
| 5 | 28483 |
| 6 | 115995 |
| 7 | 373503 |
| 8 | 1017498 |
| 9 | 2442492 |
| 10 | 5320665 |
| 11 | 10725680 |
| 12 | 20266818 |
| 13 | 36330915 |
| 14 | 62292490 |
| 15 | 102677835 |
| 16 | 163765560 |
| 17 | 253797216 |
| 18 | 382977372 |
| 19 | 565070697 |
| 20 | 817224746 |
| 21 | 1159251630 |
| 22 | 1617967923 |
| 23 | 2225268903 |
| 24 | 3015613812 |
[0,13,465,4902,28483,115995,373503,1017498, 2442492,5320665,10725680,20266818,36330915, 62292490,102677835,163765560,253797216,382977372, 565070697,817224746,1159251630,1617967923, 2225268903,3015613812] |