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A000768 as a simple table

na(n)
364
41024
512480
6137472
71443616
814786176
9149371964
101496777088
1114924375156
12148353336272
131471838989872
1414584911842000
15144423054478680

[64,1024,12480,137472,1443616,14786176,149371964,
 1496777088,14924375156,148353336272,1471838989872,
 14584911842000,144423054478680]