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A302606 as a simple table

na(n)
00
11
24
326
4240
52884
642660
7748544
815185856
9349574544
109000902500
11256293989984
127996078704240
13271246034903232
149939835626507332
15391303051339622400
1616469438021801262848
17737992773619777599744
1835077254665501330210628
191762671472887447792620032

[0,1,4,26,240,2884,42660,748544,15185856,
 349574544,9000902500,256293989984,7996078704240,
 271246034903232,9939835626507332,
 391303051339622400,16469438021801262848,
 737992773619777599744,35077254665501330210628,
 1762671472887447792620032]