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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 37 |
| 4 | 148 |
| 5 | 619 |
| 6 | 2638 |
| 7 | 11281 |
| 8 | 48040 |
| 9 | 203095 |
| 10 | 851746 |
| 11 | 3544765 |
| 12 | 14651452 |
| 13 | 60200131 |
| 14 | 246114934 |
| 15 | 1001997289 |
| 16 | 4065384784 |
| 17 | 16448074927 |
| 18 | 66394953802 |
| 19 | 267516917653 |
| 20 | 1076266398436 |
| 21 | 4324824038683 |
| 22 | 17362058273950 |
| 23 | 69646979806657 |
| 24 | 279215540418808 |
[1,3,10,37,148,619,2638,11281,48040,203095,851746, 3544765,14651452,60200131,246114934,1001997289, 4065384784,16448074927,66394953802,267516917653, 1076266398436,4324824038683,17362058273950, 69646979806657,279215540418808] |