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A018045 as a simple table

n a(n)
0 1
1 2
2 8
3 24
4 69
5 199
6 576
7 1661
8 4792
9 13824
10 39875
11 115020
12 331776
13 957007
14 2760487
15 7962624
16 22968182
17 66251701
18 191102976
19 551236370
20 1590040835
21 4586471424
22 13229672880
23 38160980055
24 110075314176
25 317512149143
26 915863521339
27 2641807540224
28 7620291579445

[1,2,8,24,69,199,576,1661,4792,13824,39875,115020,
 331776,957007,2760487,7962624,22968182,66251701,
 191102976,551236370,1590040835,4586471424,
 13229672880,38160980055,110075314176,317512149143,
 915863521339,2641807540224,7620291579445]

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)