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A007990 as a simple table

n a(n)
2 3
3 6
4 18
5 42
6 94
7 180
8 348
9 602
10 1047
11 1692
12 2737
13 4194
14 6426
15 9450
16 13863
17 19716
18 27933
19 38616
20 53160
21 71748
22 96396
23 127440
24 167704
25 217740
26 281439
27 359654
28 457617
29 576630
30 723592
31 900396
32 1116033
33 1373166
34 1683327
35 2050212
36 2488416
37 3002934
38 3612072

[3,6,18,42,94,180,348,602,1047,1692,2737,4194,
 6426,9450,13863,19716,27933,38616,53160,71748,
 96396,127440,167704,217740,281439,359654,457617,
 576630,723592,900396,1116033,1373166,1683327,
 2050212,2488416,3002934,3612072]

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Last modified December 8 02:30 EST 2019. Contains 329850 sequences. (Running on oeis4.)