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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 47 |
| 5 | 163 |
| 6 | 596 |
| 7 | 2243 |
| 8 | 8806 |
| 9 | 34773 |
| 10 | 140415 |
| 11 | 576389 |
| 12 | 2397200 |
| 13 | 10036112 |
| 14 | 42517170 |
| 15 | 181694092 |
| 16 | 781065217 |
| 17 | 3376828207 |
| 18 | 14701304614 |
| 19 | 64311598022 |
| 20 | 282420505486 |
| 21 | 1245793366982 |
| 22 | 5518688704385 |
| 23 | 24521587743488 |
| 24 | 109288995450409 |
| 25 | 488683965129030 |
| 26 | 2191109757849930 |
| 27 | 9846596587883443 |
[1,2,5,14,47,163,596,2243,8806,34773,140415, 576389,2397200,10036112,42517170,181694092, 781065217,3376828207,14701304614,64311598022, 282420505486,1245793366982,5518688704385, 24521587743488,109288995450409,488683965129030, 2191109757849930,9846596587883443] |