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A039721 as a simple table

n a(n)
1 1
2 2
3 4
4 12
5 32
6 96
7 280
8 840
9 2496
10 7488
11 22400
12 67200
13 201408
14 604224
15 1812112
16 5436336
17 16307328
18 48921984
19 146760960
20 440282880
21 1320833664
22 3962500992
23 11887458176
24 35662374528
25 106986989184
26 320960967552
27 962882499840
28 2888647499520
29 8665941290112

[1,2,4,12,32,96,280,840,2496,7488,22400,67200,
 201408,604224,1812112,5436336,16307328,48921984,
 146760960,440282880,1320833664,3962500992,
 11887458176,35662374528,106986989184,320960967552,
 962882499840,2888647499520,8665941290112]

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Last modified April 19 15:11 EDT 2024. Contains 371794 sequences. (Running on oeis4.)