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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 5 |
| 5 | 8 |
| 6 | 25 |
| 7 | 44 |
| 8 | 77 |
| 9 | 176 |
| 10 | 353 |
| 11 | 660 |
| 12 | 1365 |
| 13 | 2776 |
| 14 | 5417 |
| 15 | 10876 |
| 16 | 21981 |
| 17 | 43648 |
| 18 | 87153 |
| 19 | 175076 |
| 20 | 349669 |
| 21 | 698280 |
| 22 | 1398585 |
| 23 | 2797260 |
| 24 | 5590381 |
| 25 | 11184720 |
| 26 | 22373761 |
| 27 | 44735284 |
| 28 | 89474165 |
| 29 | 178969208 |
| 30 | 357910345 |
| 31 | 715807004 |
| 32 | 1431683837 |
| 33 | 2863325216 |
[1,0,1,4,5,8,25,44,77,176,353,660,1365,2776,5417, 10876,21981,43648,87153,175076,349669,698280, 1398585,2797260,5590381,11184720,22373761, 44735284,89474165,178969208,357910345,715807004, 1431683837,2863325216] |