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A226836 as a simple table

na(n)
136
2289
34624
410404
5115600
6248004
71083681
81281424
92232036
102509056
1121307456
1223892544
1331494544
1440144896
1566357316
16271359729
17340919296
18479785216
19512026384
20597215844
21767068416
224831918144
235454708736
248126661904
258522982400
2612273094656
2716705045504

[36,289,4624,10404,115600,248004,1083681,1281424,
 2232036,2509056,21307456,23892544,31494544,
 40144896,66357316,271359729,340919296,479785216,
 512026384,597215844,767068416,4831918144,
 5454708736,8126661904,8522982400,12273094656,
 16705045504]