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A002574 as a simple table

n a(n)
1 0
2 0
3 1
4 1
5 2
6 4
7 7
8 13
9 24
10 42
11 76
12 137
13 245
14 441
15 792
16 1420
17 2550
18 4576
19 8209
20 14732
21 26433
22 47424
23 85092
24 152670
25 273914
26 491453
27 881744
28 1581985
29 2838333
30 5092398
31 9136528
32 16392311
33 29410243
34 52766343
35 94670652
36 169853138
37 304741614
38 546751437
39 980952673
40 1759973660

[0,0,1,1,2,4,7,13,24,42,76,137,245,441,792,1420,
 2550,4576,8209,14732,26433,47424,85092,152670,
 273914,491453,881744,1581985,2838333,5092398,
 9136528,16392311,29410243,52766343,94670652,
 169853138,304741614,546751437,980952673,
 1759973660]

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Last modified November 22 05:19 EST 2014. Contains 249804 sequences.