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A014143 as a simple table

n a(n)
0 1
1 4
2 12
3 34
4 98
5 294
6 919
7 2974
8 9891
9 33604
10 116103
11 406614
12 1440025
13 5147876
14 18550572
15 67310938
16 245716094
17 901759950
18 3325066996
19 12312494462
20 45766188948
21 170702447074
22 638698318850
23 2396598337950

[1,4,12,34,98,294,919,2974,9891,33604,116103,
 406614,1440025,5147876,18550572,67310938,
 245716094,901759950,3325066996,12312494462,
 45766188948,170702447074,638698318850,
 2396598337950]

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Last modified February 19 16:02 EST 2019. Contains 320311 sequences. (Running on oeis4.)