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A220107 as a simple table

na(n)
116
2256
34020
464862
51029672
616468836
7262860066
84196749396
966990470720
101069337677856
1117068363712016
12272432545268580
134348295522399446
1469402425537376422
151107712590346165536
1617679808823449832756

[16,256,4020,64862,1029672,16468836,262860066,
 4196749396,66990470720,1069337677856,
 17068363712016,272432545268580,4348295522399446,
 69402425537376422,1107712590346165536,
 17679808823449832756]