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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 28 |
| 4 | 140 |
| 5 | 270 |
| 6 | 672 |
| 7 | 1638 |
| 8 | 2970 |
| 9 | 8190 |
| 10 | 27846 |
| 11 | 30240 |
| 12 | 167400 |
| 13 | 237510 |
| 14 | 332640 |
| 15 | 695520 |
| 16 | 1421280 |
| 17 | 2178540 |
| 18 | 2457000 |
| 19 | 11981970 |
| 20 | 14303520 |
| 21 | 17428320 |
| 22 | 23963940 |
| 23 | 27027000 |
| 24 | 46683000 |
| 25 | 56511000 |
| 26 | 71253000 |
| 27 | 142990848 |
| 28 | 163390500 |
| 29 | 164989440 |
| 30 | 191711520 |
| 31 | 400851360 |
| 32 | 407386980 |
[1,6,28,140,270,672,1638,2970,8190,27846,30240, 167400,237510,332640,695520,1421280,2178540, 2457000,11981970,14303520,17428320,23963940, 27027000,46683000,56511000,71253000,142990848, 163390500,164989440,191711520,400851360,407386980] |