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A139741 as a simple table

na(n)
00
18
2112
31304
414560
5160808
61770832
719484984
8214352320
92357928008
1025937365552
11285311493464
123138427845280
1334522710549608
14379749828800272
154177248155066744
1645949729820525440
17505447028370153608
185559917313104810992
1961159090447252284824

[0,8,112,1304,14560,160808,1770832,19484984,
 214352320,2357928008,25937365552,285311493464,
 3138427845280,34522710549608,379749828800272,
 4177248155066744,45949729820525440,
 505447028370153608,5559917313104810992,
 61159090447252284824]