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| n | a(n) |
|---|---|
| 4 | 20 |
| 5 | 116 |
| 6 | 716 |
| 7 | 2512 |
| 8 | 5036 |
| 9 | 40316 |
| 10 | 84672 |
| 11 | 176364 |
| 12 | 1390500 |
| 13 | 1782108 |
| 14 | 3628773 |
| 15 | 3628796 |
| 16 | 10529953 |
| 17 | 12258673 |
| 18 | 76944384 |
| 19 | 5338541473 |
| 20 | 8944397353 |
| 21 | 11690698969 |
| 22 | 1236868096 |
| 23 | 1849666112 |
| 24 | 3096111708 |
| 25 | 1004929973233 |
| 26 | 54465962625 |
| 27 | 1657198101073 |
| 28 | 6791831913289 |
| 29 | 1307674367996 |
| 30 | 5739085040351 |
| 31 | 21522396453889 |
| 32 | 63577408859233 |
| 33 | 104747513922049 |
| 34 | 287711613106993 |
| 35 | 626768279186209 |
[20,116,716,2512,5036,40316,84672,176364,1390500, 1782108,3628773,3628796,10529953,12258673, 76944384,5338541473,8944397353,11690698969, 1236868096,1849666112,3096111708,1004929973233, 54465962625,1657198101073,6791831913289, 1307674367996,5739085040351,21522396453889, 63577408859233,104747513922049,287711613106993, 626768279186209] |