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A151252 as a simple table

n a(n)
0 1
1 4
2 18
3 86
4 414
5 2026
6 9962
7 49220
8 243940
9 1211298
10 6024982
11 29999388
12 149506288
13 745566590
14 3719918958
15 18567624442
16 92707299566
17 463001495966
18 2312799451962
19 11554864879348
20 57736384218564
21 288523669037810
22 1441956737106318
23 7207007159715178
24 36023360349838674
25 180067567697351678

[1,4,18,86,414,2026,9962,49220,243940,1211298,
 6024982,29999388,149506288,745566590,3719918958,
 18567624442,92707299566,463001495966,
 2312799451962,11554864879348,57736384218564,
 288523669037810,1441956737106318,7207007159715178,
 36023360349838674,180067567697351678]

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Last modified April 23 02:15 EDT 2019. Contains 322380 sequences. (Running on oeis4.)