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A305836 as a simple table
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 10 |
| 7 | 12 |
| 8 | 30 |
| 9 | 78 |
| 10 | 244 |
| 11 | 490 |
| 12 | 760 |
| 13 | 1808 |
| 14 | 4790 |
| 15 | 34330 |
[0,1,2,4,6,10,12,30,78,244,490,760,1808,4790, 34330] |