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A084861 as a simple table

n a(n)
0 1
1 1
2 4
3 9
4 21
5 48
6 108
7 240
8 528
9 1152
10 2496
11 5376
12 11520
13 24576
14 52224
15 110592
16 233472
17 491520
18 1032192
19 2162688
20 4521984
21 9437184
22 19660800
23 40894464
24 84934656
25 176160768
26 364904448
27 754974720
28 1560281088
29 3221225472

[1,1,4,9,21,48,108,240,528,1152,2496,5376,11520,
 24576,52224,110592,233472,491520,1032192,2162688,
 4521984,9437184,19660800,40894464,84934656,
 176160768,364904448,754974720,1560281088,
 3221225472]

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Last modified January 19 18:20 EST 2019. Contains 319309 sequences. (Running on oeis4.)