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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 23 |
| 3 | 133 |
| 4 | 1465 |
| 5 | 37741 |
| 6 | 2194501 |
| 7 | 271424321 |
| 8 | 68861945361 |
| 9 | 35194944674859 |
| 10 | 36030017205738273 |
| 11 | 73787195288621907455 |
| 12 | 302231516037239516908817 |
| 13 | 2475880105112954130388596401 |
| 14 | 40564819225226093549492737413585 |
| 15 | 1329227995803738848421582217898872529 |
| 16 | 87112285931790992384301674169215105553521 |
[4,23,133,1465,37741,2194501,271424321, 68861945361,35194944674859,36030017205738273, 73787195288621907455,302231516037239516908817, 2475880105112954130388596401, 40564819225226093549492737413585, 1329227995803738848421582217898872529, 87112285931790992384301674169215105553521] |