| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 76 |
| 4 | 778 |
| 5 | 10026 |
| 6 | 155884 |
| 7 | 2839880 |
| 8 | 59339004 |
| 9 | 1399069450 |
| 10 | 36746349496 |
| 11 | 1064024248068 |
| 12 | 33676500286840 |
| 13 | 1156685567791586 |
| 14 | 42850609041047760 |
| 15 | 1703182952266379536 |
| 16 | 72299420602524921616 |
| 17 | 3264579136056004359570 |
| 18 | 156238968782480840396704 |
| 19 | 7900247992586138688381500 |
[1,2,10,76,778,10026,155884,2839880,59339004, 1399069450,36746349496,1064024248068, 33676500286840,1156685567791586,42850609041047760, 1703182952266379536,72299420602524921616, 3264579136056004359570,156238968782480840396704, 7900247992586138688381500] |