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A009739 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 41 |
| 6 | 142 |
| 7 | 685 |
| 8 | 3192 |
| 9 | 19921 |
| 10 | 116282 |
| 11 | 887765 |
| 12 | 6219972 |
| 13 | 56126201 |
| 14 | 458790022 |
| 15 | 4776869245 |
| 16 | 44625674352 |
| 17 | 526589630881 |
| 18 | 5534347077362 |
| 19 | 72989204937125 |
| 20 | 852334810990332 |
| 21 | 12424192360405961 |
| 22 | 159592488559874302 |
| 23 | 2547879762929443405 |
| 24 | 35703580441464231912 |
[0,1,2,5,12,41,142,685,3192,19921,116282,887765, 6219972,56126201,458790022,4776869245,44625674352, 526589630881,5534347077362,72989204937125, 852334810990332,12424192360405961, 159592488559874302,2547879762929443405, 35703580441464231912] |