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A266131 as a triangular array

1
31
491
525201
94977611
161491173851891
2562527857220995441
392141195938514336908316291
645433110444462362104197504818849731
10517269367303475761285961326145102201249446

A266131 as a square array

1345916253964105
1925491496252141543317269
1207711727819591104436730
161385572385144623347576
118920994336621041285961
1544908319750326145
1162948188102201
14973249446
1
1345916253964105
1925491496252141543317269
1207711727819591104436730
161385572385144623347576
118920994336621041285961
1544908319750326145
1162948188102201
14973249446
1