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A306640 as a triangular array

3
62
743
20832
1320563
21710442
154276933
541621125862
41131342720543
11040271614620432
275521542381310963
156255511

A306640 as a square array

36720132115544111027156
248207421613405525
3351072113272155
26461242165411
349571423
2382068
3652013
24410
339
26
3
36720132115544111027156
248207421613405525
3351072113272155
26461242165411
349571423
2382068
3652013
24410
339
26
3