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A203635 as a simple table

na(n)
18
226
3236
43824
558816
6951900
716080792
8278135578
94911608328
1088014442794
111595784960340
1229207585540256
13538759416109136
1410003103446747306
15186764193731244404
163503820046529733422
1766010275892736979884

[8,26,236,3824,58816,951900,16080792,278135578,
 4911608328,88014442794,1595784960340,
 29207585540256,538759416109136,10003103446747306,
 186764193731244404,3503820046529733422,
 66010275892736979884]