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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 260 |
| 3 | 7595 |
| 4 | 94360 |
| 5 | 723534 |
| 6 | 4037712 |
| 7 | 17944290 |
| 8 | 67127880 |
| 9 | 219319815 |
| 10 | 642251428 |
| 11 | 1718012933 |
| 12 | 4258676240 |
| 13 | 9892043980 |
| 14 | 21721707840 |
| 15 | 45414150132 |
| 16 | 90930820464 |
| 17 | 175208925885 |
| 18 | 326205634020 |
| 19 | 588861675535 |
| 20 | 1033717781096 |
| 21 | 1769137540730 |
| 22 | 2958360418000 |
| 23 | 4842936861750 |
| 24 | 7774492635000 |
[1,260,7595,94360,723534,4037712,17944290, 67127880,219319815,642251428,1718012933, 4258676240,9892043980,21721707840,45414150132, 90930820464,175208925885,326205634020, 588861675535,1033717781096,1769137540730, 2958360418000,4842936861750,7774492635000] |