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A290904 as a simple table

na(n)
00
12
28
324
472
5222
6688
72128
86576
920322
1062808
11194120
12599960
131854270
145730912
1517712288
1654742624
17169190722
18522910632
191616137848
204994929128
2115437616926
2247712391952
23147462678768
24455756685840
251408587979170
264353463496440
2713455066133672

[0,2,8,24,72,222,688,2128,6576,20322,62808,194120,
 599960,1854270,5730912,17712288,54742624,
 169190722,522910632,1616137848,4994929128,
 15437616926,47712391952,147462678768,455756685840,
 1408587979170,4353463496440,13455066133672]