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A277656 as a simple table

na(n)
10
28
3356
418754
5853778
641272404
71939853778
892010224525
94354590810315
10206242664480842
119765809059667609
12462455214528524834
1321898899233136089824
141036995973723303272825
1549105621425306924377132

[0,8,356,18754,853778,41272404,1939853778,
 92010224525,4354590810315,206242664480842,
 9765809059667609,462455214528524834,
 21898899233136089824,1036995973723303272825,
 49105621425306924377132]