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| n | a(n) |
|---|---|
| 1 | 88 |
| 2 | 454 |
| 3 | 2056 |
| 4 | 10076 |
| 5 | 46804 |
| 6 | 226072 |
| 7 | 1060636 |
| 8 | 5086576 |
| 9 | 23991808 |
| 10 | 114597900 |
| 11 | 542168944 |
| 12 | 2583725396 |
| 13 | 12245147680 |
| 14 | 58277217168 |
| 15 | 276473917972 |
| 16 | 1314790543248 |
| 17 | 6241143226396 |
| 18 | 29667097057792 |
| 19 | 140873066386336 |
| 20 | 669466007785964 |
[88,454,2056,10076,46804,226072,1060636,5086576, 23991808,114597900,542168944,2583725396, 12245147680,58277217168,276473917972, 1314790543248,6241143226396,29667097057792, 140873066386336,669466007785964] |