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A002026 as a simple table

n a(n)
0 0
1 1
2 2
3 5
4 12
5 30
6 76
7 196
8 512
9 1353
10 3610
11 9713
12 26324
13 71799
14 196938
15 542895
16 1503312
17 4179603
18 11662902
19 32652735
20 91695540
21 258215664
22 728997192
23 2062967382
24 5850674704
25 16626415975
26 47337954326
27 135015505407
28 385719506620
29 1103642686382
30 3162376205180
31 9073807670316
32 26068895429376

[0,1,2,5,12,30,76,196,512,1353,3610,9713,26324,
 71799,196938,542895,1503312,4179603,11662902,
 32652735,91695540,258215664,728997192,2062967382,
 5850674704,16626415975,47337954326,135015505407,
 385719506620,1103642686382,3162376205180,
 9073807670316,26068895429376]

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Last modified February 20 01:26 EST 2018. Contains 299357 sequences. (Running on oeis4.)