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A003080 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 37 |
| 6 | 111 |
| 7 | 345 |
| 8 | 1105 |
| 9 | 3624 |
| 10 | 12099 |
| 11 | 41000 |
| 12 | 140647 |
| 13 | 487440 |
| 14 | 1704115 |
| 15 | 6002600 |
| 16 | 21282235 |
| 17 | 75890812 |
| 18 | 272000538 |
| 19 | 979310627 |
| 20 | 3540297130 |
| 21 | 12845634348 |
| 22 | 46764904745 |
| 23 | 170767429511 |
| 24 | 625314778963 |
| 25 | 2295635155206 |
| 26 | 8447553316546 |
| 27 | 31153444946778 |
| 28 | 115122389065883 |
[1,1,2,5,13,37,111,345,1105,3624,12099,41000, 140647,487440,1704115,6002600,21282235,75890812, 272000538,979310627,3540297130,12845634348, 46764904745,170767429511,625314778963, 2295635155206,8447553316546,31153444946778, 115122389065883] |