login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A075569 as a simple table

na(n)
11
21
31
42
52
64
76
86
96
108
1110
1212
1312
1412
1514
1616
1718
1818
1918
2024
2132
2234
2336
2438
2542
2646
2748
2854
2956
3064
3168
3278
3390
3490
3594
36102
37114
38122
39124
40134
41144
42148
43150
44152
45160
46168
47170
48178
49182
50190
51192
52200
53216
54220
55222
56234
57234
58234
59246
60260
61264
62268
63270

[1,1,1,2,2,4,6,6,6,8,10,12,12,12,14,16,18,18,18,
 24,32,34,36,38,42,46,48,54,56,64,68,78,90,90,94,
 102,114,122,124,134,144,148,150,152,160,168,170,
 178,182,190,192,200,216,220,222,234,234,234,246,
 260,264,268,270]