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A178476 as a simple table

na(n)
1123456
2123465
3123546
4123564
5123645
6123654
7124356
8124365
9124536
10124563
11124635
12124653
13125346
14125364
15125436
16125463
17125634
18125643
19126345
20126354
21126435
22126453
23126534
24126543
25132456
26132465
27132546
28132564
29132645
30132654

[123456,123465,123546,123564,123645,123654,124356,
 124365,124536,124563,124635,124653,125346,125364,
 125436,125463,125634,125643,126345,126354,126435,
 126453,126534,126543,132456,132465,132546,132564,
 132645,132654]