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A005002 as a simple table

n a(n)
1 1
2 4
3 13
4 41
5 134
6 471
7 1819
8 7778
9 36703
10 189381
11 1057332
12 6328261
13 40300959
14 271501240
15 1925961025
16 14332064197
17 111528998198
18 905134802555
19 7643011810167
20 67010181855706
21 608890179868163
22 5724496098183649

[1,4,13,41,134,471,1819,7778,36703,189381,1057332,
 6328261,40300959,271501240,1925961025,14332064197,
 111528998198,905134802555,7643011810167,
 67010181855706,608890179868163,5724496098183649]

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Last modified November 19 07:16 EST 2017. Contains 294916 sequences.