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A024049 as a simple table

n a(n)
0 0
1 4
2 24
3 124
4 624
5 3124
6 15624
7 78124
8 390624
9 1953124
10 9765624
11 48828124
12 244140624
13 1220703124
14 6103515624
15 30517578124
16 152587890624
17 762939453124
18 3814697265624
19 19073486328124
20 95367431640624

[0,4,24,124,624,3124,15624,78124,390624,1953124,
 9765624,48828124,244140624,1220703124,6103515624,
 30517578124,152587890624,762939453124,
 3814697265624,19073486328124,95367431640624]

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Last modified April 1 05:04 EDT 2020. Contains 333155 sequences. (Running on oeis4.)