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A007983 as a simple table

n a(n)
1 0
2 0
3 1
4 2
5 4
6 7
7 10
8 15
9 20
10 27
11 34
12 44
13 53
14 66
15 78
16 94
17 109
18 129
19 147
20 171
21 193
22 221
23 247
24 280
25 310
26 348
27 383
28 426
29 466
30 515
31 560
32 615
33 666
34 727
35 784
36 852
37 915
38 990
39 1060
40 1142
41 1219
42 1309
43 1393
44 1491
45 1583
46 1689
47 1789
48 1904
49 2012
50 2136
51 2253
52 2386
53 2512

[0,0,1,2,4,7,10,15,20,27,34,44,53,66,78,94,109,
 129,147,171,193,221,247,280,310,348,383,426,466,
 515,560,615,666,727,784,852,915,990,1060,1142,
 1219,1309,1393,1491,1583,1689,1789,1904,2012,2136,
 2253,2386,2512]

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Last modified April 24 15:57 EDT 2024. Contains 371961 sequences. (Running on oeis4.)