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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 158 |
| 5 | 651 |
| 6 | 2763 |
| 7 | 11915 |
| 8 | 51832 |
| 9 | 227963 |
| 10 | 1010967 |
| 11 | 4508263 |
| 12 | 20218248 |
| 13 | 91123461 |
| 14 | 412253390 |
| 15 | 1871732613 |
| 16 | 8525963254 |
| 17 | 38943324921 |
| 18 | 178323541213 |
| 19 | 818456588811 |
| 20 | 3764239590690 |
| 21 | 17345032773699 |
| 22 | 80063681786158 |
| 23 | 370161938592009 |
| 24 | 1713911385932200 |
| 25 | 7946660773810981 |
| 26 | 36892478429424459 |
[1,3,10,39,158,651,2763,11915,51832,227963, 1010967,4508263,20218248,91123461,412253390, 1871732613,8525963254,38943324921,178323541213, 818456588811,3764239590690,17345032773699, 80063681786158,370161938592009,1713911385932200, 7946660773810981,36892478429424459] |