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A337775 as a simple table

na(n)
12
218
3250
46174
53660250
61542294
72839714
841154
9117793122328750
107978057537338
112898701538750
1233734898
1329688151506250
1421107677374
1569834458642125879757481250
163999523458421521342

[2,18,250,6174,3660250,1542294,2839714,41154,
 117793122328750,7978057537338,2898701538750,
 33734898,29688151506250,21107677374,
 69834458642125879757481250,3999523458421521342]