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A020708 as a simple table

n a(n)
0 4
1 9
2 20
3 44
4 97
5 214
6 472
7 1041
8 2296
9 5064
10 11169
11 24634
12 54332
13 119833
14 264300
15 582932
16 1285697
17 2835694
18 6254320
19 13794337
20 30424368
21 67103056
22 148000449
23 326425266
24 719953588
25 1587907625
26 3502240516
27 7724434620
28 17036776865
29 37575794246
30 82876023112

[4,9,20,44,97,214,472,1041,2296,5064,11169,24634,
 54332,119833,264300,582932,1285697,2835694,
 6254320,13794337,30424368,67103056,148000449,
 326425266,719953588,1587907625,3502240516,
 7724434620,17036776865,37575794246,82876023112]

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Last modified May 13 19:11 EDT 2024. Contains 372522 sequences. (Running on oeis4.)