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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 526 |
| 3 | 17575 |
| 4 | 178870 |
| 5 | 1016737 |
| 6 | 4083008 |
| 7 | 13011585 |
| 8 | 35154340 |
| 9 | 83916031 |
| 10 | 181913856 |
| 11 | 365087337 |
| 12 | 687884214 |
| 13 | 1229647953 |
| 14 | 2102332580 |
| 15 | 3459670513 |
| 16 | 5507918992 |
| 17 | 8518310823 |
| 18 | 12841335118 |
| 19 | 18922973607 |
| 20 | 27323018256 |
| 21 | 38735595881 |
| 22 | 54012025302 |
| 23 | 74186132807 |
| 24 | 100502151596 |
[0,1,526,17575,178870,1016737,4083008,13011585, 35154340,83916031,181913856,365087337,687884214, 1229647953,2102332580,3459670513,5507918992, 8518310823,12841335118,18922973607,27323018256, 38735595881,54012025302,74186132807,100502151596] |