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A278559 as a simple table

na(n)
01575
1173525
27089500
3169229875
42841940500
537027355200
6397125074750
73646072432125
829454549941750
9213636919820625
101412749565173450
118620496275465025
1249005643635237875
13261578907351144125
141319510599727473500
156324621482504294325
1628938037257084798150

[1575,173525,7089500,169229875,2841940500,
 37027355200,397125074750,3646072432125,
 29454549941750,213636919820625,1412749565173450,
 8620496275465025,49005643635237875,
 261578907351144125,1319510599727473500,
 6324621482504294325,28938037257084798150]