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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 34 |
| 6 | 154 |
| 7 | 874 |
| 8 | 5914 |
| 9 | 46234 |
| 10 | 409114 |
| 11 | 4037914 |
| 12 | 43954714 |
| 13 | 522956314 |
| 14 | 6749977114 |
| 15 | 93928268314 |
| 16 | 1401602636314 |
| 17 | 22324392524314 |
| 18 | 378011820620314 |
| 19 | 6780385526348314 |
| 20 | 128425485935180314 |
| 21 | 2561327494111820314 |
| 22 | 53652269665821260314 |
| 23 | 1177652997443428940314 |
[0,1,2,4,10,34,154,874,5914,46234,409114,4037914, 43954714,522956314,6749977114,93928268314, 1401602636314,22324392524314,378011820620314, 6780385526348314,128425485935180314, 2561327494111820314,53652269665821260314, 1177652997443428940314] |