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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 13 |
| 4 | 46 |
| 5 | 166 |
| 6 | 616 |
| 7 | 2317 |
| 8 | 8818 |
| 9 | 33862 |
| 10 | 130906 |
| 11 | 508690 |
| 12 | 1985158 |
| 13 | 7773886 |
| 14 | 30528118 |
| 15 | 120165583 |
| 16 | 473939962 |
| 17 | 1872379006 |
| 18 | 7407691624 |
| 19 | 29343102082 |
| 20 | 116356441630 |
| 21 | 461821527304 |
| 22 | 1834453407664 |
| 23 | 7291975192036 |
| 24 | 29003636757940 |
| 25 | 115424203565524 |
| 26 | 459569872509772 |
| 27 | 1830597853159408 |
[1,1,4,13,46,166,616,2317,8818,33862,130906, 508690,1985158,7773886,30528118,120165583, 473939962,1872379006,7407691624,29343102082, 116356441630,461821527304,1834453407664, 7291975192036,29003636757940,115424203565524, 459569872509772,1830597853159408] |