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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 14 |
| 2 | 154 |
| 3 | 1540 |
| 4 | 14630 |
| 5 | 134596 |
| 6 | 1211364 |
| 7 | 10729224 |
| 8 | 93880710 |
| 9 | 813632820 |
| 10 | 6997242252 |
| 11 | 59794615608 |
| 12 | 508254232668 |
| 13 | 4300612737960 |
| 14 | 36248021648520 |
| 15 | 304483381847568 |
| 16 | 2550048322973382 |
| 17 | 21300403638954132 |
| 18 | 177503363657951100 |
| 19 | 1476080603050330200 |
| 20 | 12251469005317740660 |
| 21 | 101512171758346994040 |
[1,14,154,1540,14630,134596,1211364,10729224, 93880710,813632820,6997242252,59794615608, 508254232668,4300612737960,36248021648520, 304483381847568,2550048322973382, 21300403638954132,177503363657951100, 1476080603050330200,12251469005317740660, 101512171758346994040] |