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A290915 as a simple table

na(n)
00
18
232
3144
4672
53096
614272
765824
8303552
91399848
106455520
1129770160
12137287520
13633112632
142919650688
1513464207936
1662091296128
17286339090504
181320476135328
196089483698896
2028082152132128
21129503141377112
22597214328432960
232754102721315680

[0,8,32,144,672,3096,14272,65824,303552,1399848,
 6455520,29770160,137287520,633112632,2919650688,
 13464207936,62091296128,286339090504,
 1320476135328,6089483698896,28082152132128,
 129503141377112,597214328432960,2754102721315680]