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”).

A172363 as a simple table

na(n)
01
11
21
31
41
51
61
71
81
91
101
111
121
131
141
151
162
172
182
192
201
211
223
236
246
256
263
271
281
294
3012
3124
3224
3312
344
351
361
375
3820
3960
40120
4160
4220
435
441
451
467
4735
48140
49420
50420
51140
5235
537
541
551
5610
5770
58350
591400
602100
611400
62350
6370
6410
651

[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,1,1,3,6,
 6,6,3,1,1,4,12,24,24,12,4,1,1,5,20,60,120,60,20,5,
 1,1,7,35,140,420,420,140,35,7,1,1,10,70,350,1400,
 2100,1400,350,70,10,1]