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A247601型作为一个简单的表

n个a(n)
12
21
13
431
573
6181
7443
82249
9238839
106473
1130001
1240123
13108539
14251707
15637321
167554079
174124437
18241895689
1927067097
2069709723
21179992919
221019958623
231208198863
243140421743
258179002173

[2,1,13,31,73,181,443,2249,238839,6473,30001,40123,108539,251707,637321,7554079,4124437,241895689,27067097,69709723,179992919,1019958623,1208198863,3140421743,8179002173]