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A145166 as a simple table

na(n)
01
15
240
3510
49095
5203376
65323465
7156499485
85035901400
9174413579095
106427089519606
11249922852038280
1210193367893772075
13434056833951578950
1419227980415244742745
15883565304511733011301
1642019895809388715550450

[1,5,40,510,9095,203376,5323465,156499485,
 5035901400,174413579095,6427089519606,
 249922852038280,10193367893772075,
 434056833951578950,19227980415244742745,
 883565304511733011301,42019895809388715550450]