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”).

A263991 as a simple table

na(n)
11
22
32
44
54
64
72
88
98
108
116
128
134
144
152
1616
1716
1816
1914
2016
2112
2212
2310
2416
258
268
276
288
294
304
312
3232
3332
3432
3530
3632
3728
3828
3926
4032
4124
4224
4322
4424
4520
4620
4718
4832
4916
5016
5114
5216
5312
5412
5510
5616
578
588
596
608
614
624
632
6464
6564
6664
6762
6864
6960
7060
7158
7264
7356
7456
7554
7656
7752
7852
7950
8064
8148
8248
8346
8448
8544
8644
8742
8848
8940
9040
9138
9240
9336
9436
9534
9664
9732
9832
9930

[1,2,2,4,4,4,2,8,8,8,6,8,4,4,2,16,16,16,14,16,12,
 12,10,16,8,8,6,8,4,4,2,32,32,32,30,32,28,28,26,32,
 24,24,22,24,20,20,18,32,16,16,14,16,12,12,10,16,8,
 8,6,8,4,4,2,64,64,64,62,64,60,60,58,64,56,56,54,
 56,52,52,50,64,48,48,46,48,44,44,42,48,40,40,38,
 40,36,36,34,64,32,32,30]