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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 15 |
| 4 | 24 |
| 5 | 56 |
| 6 | 104 |
| 7 | 248 |
| 8 | 392 |
| 9 | 912 |
| 10 | 1720 |
| 11 | 4076 |
| 12 | 6174 |
| 13 | 14371 |
| 14 | 26656 |
| 15 | 63488 |
| 16 | 100352 |
| 17 | 233472 |
| 18 | 440320 |
| 19 | 1043456 |
| 20 | 1579008 |
| 21 | 3681280 |
| 22 | 6831104 |
| 23 | 16253952 |
| 24 | 25693184 |
| 25 | 59773952 |
| 26 | 112727040 |
| 27 | 267138048 |
| 28 | 404235264 |
| 29 | 942418944 |
| 30 | 1748909056 |
| 31 | 4160889856 |
| 32 | 6576811008 |
[1,3,6,15,24,56,104,248,392,912,1720,4076,6174, 14371,26656,63488,100352,233472,440320,1043456, 1579008,3681280,6831104,16253952,25693184, 59773952,112727040,267138048,404235264,942418944, 1748909056,4160889856,6576811008] |