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”).

A278247 as a simple table

na(n)
01
12
22
32
42
52
66
72
82
92
102
116
122
136
142
152
166
176
182
192
202
216
226
232
246
252
266
272
286
292
302
316
326
336
342
358
366
372
382
396
402
4112
426
432
442
452
4630
472
486
492
506
5130
522
532
542
552
566
576
582
592
606
6130
626
632
642
652
666
672
686
692
706
716
726
736
746
752
766
776
786
7930
806
816
822
8312
842
852
866
876
882
896
906
9130
922
932
946
952
966
976
986
992
1002
10130
1022
1036
1046
1056
1066
1076
1086
1096
1106
1116
1126
1132
1142
1156
11630
1176
1186

[1,2,2,2,2,2,6,2,2,2,2,6,2,6,2,2,6,6,2,2,2,6,6,2,
 6,2,6,2,6,2,2,6,6,6,2,8,6,2,2,6,2,12,6,2,2,2,30,2,
 6,2,6,30,2,2,2,2,6,6,2,2,6,30,6,2,2,2,6,2,6,2,6,6,
 6,6,6,2,6,6,6,30,6,6,2,12,2,2,6,6,2,6,6,30,2,2,6,
 2,6,6,6,2,2,30,2,6,6,6,6,6,6,6,6,6,6,2,2,6,30,6,6]