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A336906 as a simple table

na(n)
01
18
256
3296
41640
58984
649256
7266600
81448072
97820984
1042316952
11227940584
121229803016
136612947048
1435605181720
15191204813288
161027868658200

[1,8,56,296,1640,8984,49256,266600,1448072,
 7820984,42316952,227940584,1229803016,6612947048,
 35605181720,191204813288,1027868658200]