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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 53 |
| 5 | 634 |
| 6 | 4201 |
| 7 | 20120 |
| 8 | 78753 |
| 9 | 269829 |
| 10 | 844702 |
| 11 | 2486178 |
| 12 | 7017354 |
| 13 | 19260116 |
| 14 | 51903794 |
| 15 | 138254821 |
| 16 | 365619439 |
| 17 | 962704734 |
| 18 | 2528441803 |
| 19 | 6631057180 |
| 20 | 17376467099 |
| 21 | 45514392201 |
| 22 | 119188310928 |
| 23 | 312079208726 |
| 24 | 817086876180 |
| 25 | 2139230058328 |
| 26 | 5600665608772 |
| 27 | 14662845807193 |
[1,53,634,4201,20120,78753,269829,844702,2486178, 7017354,19260116,51903794,138254821,365619439, 962704734,2528441803,6631057180,17376467099, 45514392201,119188310928,312079208726, 817086876180,2139230058328,5600665608772, 14662845807193] |