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- n a(n)
- 1 1
- 2 0
- 3 0
- 4 2
- 5 10
- 6 4
- 7 40
- 8 92
- 9 352
- 10 724
- 11 2680
- 12 14200
- 13 73712
- 14 365596
- 15 2279184
- 16 14772512
- 17 95815104
- 18 666090624
- 19 4968057848
- 20 39029188884
- 21 314666222712
- 22 2691008701644
- 23 24233937684440
- 24 227514171973736
- 25 2207893435808352
- 26 22317699616364044
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