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A020883 as a simple table

n a(n)
1 4
2 12
3 15
4 21
5 24
6 35
7 40
8 45
9 55
10 56
11 60
12 63
13 72
14 77
15 80
16 84
17 91
18 99
19 105
20 112
21 117
22 120
23 132
24 140
25 143
26 144
27 153
28 156
29 165
30 168
31 171
32 176
33 180
34 187
35 195
36 208
37 209
38 220
39 221
40 224
41 231
42 240
43 247
44 252
45 253
46 255
47 260
48 264
49 272
50 273
51 275
52 285
53 288
54 299
55 304
56 308
57 312
58 323

[4,12,15,21,24,35,40,45,55,56,60,63,72,77,80,84,
 91,99,105,112,117,120,132,140,143,144,153,156,165,
 168,171,176,180,187,195,208,209,220,221,224,231,
 240,247,252,253,255,260,264,272,273,275,285,288,
 299,304,308,312,323]

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Last modified January 22 12:13 EST 2019. Contains 319363 sequences. (Running on oeis4.)