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A278771 as a simple table

na(n)
10
22
3266
419750
51673658
6251740932
790752836672
893037538287080
9293564184229043556
102953569640505846392444

[0,2,266,19750,1673658,251740932,90752836672,
 93037538287080,293564184229043556,
 2953569640505846392444]