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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 4 |
| 5 | 3 |
| 6 | 4 |
| 7 | 0 |
| 8 | 11 |
| 9 | 31 |
| 10 | 70 |
| 11 | 177 |
| 12 | 242 |
| 13 | 382 |
| 14 | 482 |
| 15 | 874 |
| 16 | 1655 |
| 17 | 4440 |
| 18 | 10696 |
| 19 | 24390 |
| 20 | 49867 |
| 21 | 95850 |
| 22 | 172980 |
| 23 | 289229 |
| 24 | 492233 |
| 25 | 811753 |
| 26 | 1468084 |
| 27 | 2813206 |
| 28 | 5929361 |
| 29 | 12780690 |
| 30 | 27858421 |
| 31 | 59275097 |
| 32 | 122326098 |
| 33 | 243179349 |
| 34 | 467856049 |
| 35 | 873044584 |
| 36 | 1588187110 |
| 37 | 2842593612 |
[1,1,0,0,4,3,4,0,11,31,70,177,242,382,482,874, 1655,4440,10696,24390,49867,95850,172980,289229, 492233,811753,1468084,2813206,5929361,12780690, 27858421,59275097,122326098,243179349,467856049, 873044584,1588187110,2842593612] |