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A270810 as a simple table

n a(n)
0 0
1 1
2 2
3 6
4 16
5 36
6 76
7 156
8 316
9 636
10 1276
11 2556
12 5116
13 10236
14 20476
15 40956
16 81916
17 163836
18 327676
19 655356
20 1310716
21 2621436
22 5242876
23 10485756
24 20971516
25 41943036
26 83886076
27 167772156
28 335544316
29 671088636
30 1342177276
31 2684354556
32 5368709116
33 10737418236
34 21474836476

[0,1,2,6,16,36,76,156,316,636,1276,2556,5116,
 10236,20476,40956,81916,163836,327676,655356,
 1310716,2621436,5242876,10485756,20971516,
 41943036,83886076,167772156,335544316,671088636,
 1342177276,2684354556,5368709116,10737418236,
 21474836476]

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Last modified October 18 08:04 EDT 2019. Contains 328146 sequences. (Running on oeis4.)