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”).

A174411 as a simple table

na(n)
01
11
21
31
42
51
61
76
86
91
101
1115
1290
1315
141
151
1640
17600
18600
1940
201
211
22104
234160
2462400
254160
26104
271
281
29273
3028392
311135680
321135680
3328392
34273
351
361
37714
38194922
3920271888
40810875520
4120271888
42194922
43714
441
451
461870
471335180
48364504140

[1,1,1,1,2,1,1,6,6,1,1,15,90,15,1,1,40,600,600,40,
 1,1,104,4160,62400,4160,104,1,1,273,28392,1135680,
 1135680,28392,273,1,1,714,194922,20271888,
 810875520,20271888,194922,714,1,1,1870,1335180,
 364504140]