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A059507 as a simple table
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 24 |
| 4 | 66 |
| 5 | 182 |
| 6 | 501 |
| 7 | 1376 |
| 8 | 3771 |
| 9 | 10314 |
| 10 | 28158 |
| 11 | 76744 |
| 12 | 208839 |
| 13 | 567484 |
| 14 | 1539981 |
| 15 | 4173852 |
| 16 | 11299386 |
| 17 | 30556346 |
| 18 | 82547961 |
| 19 | 222790424 |
| 20 | 600753663 |
| 21 | 1618558734 |
| 22 | 4357256694 |
| 23 | 11721125644 |
| 24 | 31507528971 |
| 25 | 84637773172 |
[4,9,24,66,182,501,1376,3771,10314,28158,76744, 208839,567484,1539981,4173852,11299386,30556346, 82547961,222790424,600753663,1618558734, 4357256694,11721125644,31507528971,84637773172] |