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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 110 |
| 5 | 1954 |
| 6 | 47270 |
| 7 | 1437562 |
| 8 | 52531310 |
| 9 | 2239259266 |
| 10 | 109021857446 |
| 11 | 5966767051354 |
| 12 | 362558298692270 |
| 13 | 24214789406313442 |
| 14 | 1763062297639690790 |
| 15 | 138975554045857840570 |
| 16 | 11790733617760291994990 |
| 17 | 1071215297856049456744642 |
[1,1,2,10,110,1954,47270,1437562,52531310, 2239259266,109021857446,5966767051354, 362558298692270,24214789406313442, 1763062297639690790,138975554045857840570, 11790733617760291994990,1071215297856049456744642] |