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A281064 as a simple table

n a(n)
1 4
2 16
3 56
4 284
5 1004
6 5096
7 18016
8 91444
9 323284
10 1640896
11 5801096
12 29444684
13 104096444
14 528363416
15 1867934896
16 9481096804
17 33518731684
18 170131379056
19 601469235416
20 3052883726204
21 10792927505804
22 54781775692616
23 193671225869056
24 983019078740884

[4,16,56,284,1004,5096,18016,91444,323284,1640896,
 5801096,29444684,104096444,528363416,1867934896,
 9481096804,33518731684,170131379056,601469235416,
 3052883726204,10792927505804,54781775692616,
 193671225869056,983019078740884]

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Last modified January 17 15:20 EST 2022. Contains 350402 sequences. (Running on oeis4.)