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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 400 |
| 3 | 1866 |
| 4 | 7879 |
| 5 | 20226 |
| 6 | 54887 |
| 7 | 116036 |
| 8 | 255009 |
| 9 | 481390 |
| 10 | 932245 |
| 11 | 1627470 |
| 12 | 2893983 |
| 13 | 4765598 |
| 14 | 7967260 |
| 15 | 12535320 |
| 16 | 20000374 |
| 17 | 30337594 |
| 18 | 46665892 |
| 19 | 68699820 |
| 20 | 102616722 |
| 21 | 147369478 |
| 22 | 214889742 |
| 23 | 302259706 |
| 24 | 431988823 |
| 25 | 597033836 |
| 26 | 838908027 |
[20,400,1866,7879,20226,54887,116036,255009, 481390,932245,1627470,2893983,4765598,7967260, 12535320,20000374,30337594,46665892,68699820, 102616722,147369478,214889742,302259706,431988823, 597033836,838908027] |