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A007141 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 22 |
| 5 | 75 |
| 6 | 250 |
| 7 | 886 |
| 8 | 3150 |
| 9 | 11525 |
| 10 | 42698 |
| 11 | 160636 |
| 12 | 610694 |
| 13 | 2345584 |
| 14 | 9081850 |
| 15 | 35422281 |
| 16 | 139022744 |
| 17 | 548671671 |
| 18 | 2176051206 |
| 19 | 8668363781 |
| 20 | 34667284600 |
| 21 | 139140831224 |
| 22 | 560271494924 |
| 23 | 2262709876353 |
| 24 | 9163000968906 |
| 25 | 37198940600718 |
| 26 | 151364381619042 |
[1,2,7,22,75,250,886,3150,11525,42698,160636, 610694,2345584,9081850,35422281,139022744, 548671671,2176051206,8668363781,34667284600, 139140831224,560271494924,2262709876353, 9163000968906,37198940600718,151364381619042] |