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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 68 |
| 4 | 352 |
| 5 | 1895 |
| 6 | 10509 |
| 7 | 59619 |
| 8 | 344380 |
| 9 | 2018599 |
| 10 | 11976479 |
| 11 | 71786394 |
| 12 | 434049233 |
| 13 | 2644251959 |
| 14 | 16214959902 |
| 15 | 100008206636 |
| 16 | 619980261922 |
| 17 | 3861037683008 |
| 18 | 24144159455460 |
| 19 | 151540706064143 |
| 20 | 954348342189353 |
| 21 | 6028591984661431 |
| 22 | 38189462008586184 |
| 23 | 242544213458754883 |
[1,3,14,68,352,1895,10509,59619,344380,2018599, 11976479,71786394,434049233,2644251959, 16214959902,100008206636,619980261922, 3861037683008,24144159455460,151540706064143, 954348342189353,6028591984661431, 38189462008586184,242544213458754883] |