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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 83 |
| 4 | 656 |
| 5 | 5101 |
| 6 | 39446 |
| 7 | 304615 |
| 8 | 2353180 |
| 9 | 18198497 |
| 10 | 140935202 |
| 11 | 1093058523 |
| 12 | 8489861160 |
| 13 | 66033483733 |
| 14 | 514279211054 |
| 15 | 4010208001999 |
| 16 | 31306199597108 |
| 17 | 244654627880905 |
| 18 | 1913827008446522 |
| 19 | 14984671523766211 |
[1,10,83,656,5101,39446,304615,2353180,18198497, 140935202,1093058523,8489861160,66033483733, 514279211054,4010208001999,31306199597108, 244654627880905,1913827008446522, 14984671523766211] |