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A003470 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 31 |
| 5 | 147 |
| 6 | 853 |
| 7 | 5824 |
| 8 | 45741 |
| 9 | 405845 |
| 10 | 4012711 |
| 11 | 43733976 |
| 12 | 520795003 |
| 13 | 6726601063 |
| 14 | 93651619881 |
| 15 | 1398047697152 |
| 16 | 22275111534553 |
| 17 | 377278848390249 |
| 18 | 6768744159489931 |
| 19 | 128228860181918440 |
| 20 | 2557808459478878871 |
| 21 | 53585748788874537851 |
| 22 | 1176328664895760953853 |
[1,1,3,8,31,147,853,5824,45741,405845,4012711, 43733976,520795003,6726601063,93651619881, 1398047697152,22275111534553,377278848390249, 6768744159489931,128228860181918440, 2557808459478878871,53585748788874537851, 1176328664895760953853] |