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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 18 |
| 3 | 112 |
| 4 | 847 |
| 5 | 7086 |
| 6 | 62974 |
| 7 | 583002 |
| 8 | 5560323 |
| 9 | 54249583 |
| 10 | 538873135 |
| 11 | 5431177821 |
| 12 | 55402340842 |
| 13 | 570899082760 |
| 14 | 5933922697380 |
| 15 | 62138800690564 |
| 16 | 654949976467593 |
| 17 | 6942859160218698 |
| 18 | 73972792893687427 |
| 19 | 791722414873487767 |
| 20 | 8508265804914763731 |
[1,4,18,112,847,7086,62974,583002,5560323, 54249583,538873135,5431177821,55402340842, 570899082760,5933922697380,62138800690564, 654949976467593,6942859160218698, 73972792893687427,791722414873487767, 8508265804914763731] |