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A026337 as a simple table

na(n)
00
16
2120
32016
432640
5523776
68386560
7134209536
82147450880
934359607296
10549755289600
118796090925056
12140737479966720
132251799780130816
1436028796884746240
15576460751766552576
169223372034707292160
17147573952581086478336
182361183241400462868480

[0,6,120,2016,32640,523776,8386560,134209536,
 2147450880,34359607296,549755289600,8796090925056,
 140737479966720,2251799780130816,
 36028796884746240,576460751766552576,
 9223372034707292160,147573952581086478336,
 2361183241400462868480]