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A168444 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 21 |
| 7 | 91 |
| 8 | 422 |
| 9 | 2103 |
| 10 | 11226 |
| 11 | 63879 |
| 12 | 385691 |
| 13 | 2461004 |
| 14 | 16535820 |
| 15 | 116628147 |
| 16 | 861033654 |
| 17 | 6637143698 |
| 18 | 53297137552 |
| 19 | 444940442553 |
| 20 | 3854539901147 |
| 21 | 34592812084693 |
| 22 | 321125878230123 |
| 23 | 3079144039478532 |
| 24 | 30457076370822777 |
| 25 | 310407099470429818 |
| 26 | 3255972198123974137 |
| 27 | 35114803641531204063 |
[1,0,0,0,1,5,21,91,422,2103,11226,63879,385691, 2461004,16535820,116628147,861033654,6637143698, 53297137552,444940442553,3854539901147, 34592812084693,321125878230123,3079144039478532, 30457076370822777,310407099470429818, 3255972198123974137,35114803641531204063] |