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A253992 as a simple table

na(n)
13644672
243840181
3890259584
420976836853
5431011794558
69417047685594
7214599818292970
84763204685284070
9105382980758778328
102352723588969755035
1152407266256039457556
121163450914128007674788
1325860536986335538468356

[3644672,43840181,890259584,20976836853,
 431011794558,9417047685594,214599818292970,
 4763204685284070,105382980758778328,
 2352723588969755035,52407266256039457556,
 1163450914128007674788,25860536986335538468356]