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A251928 as a simple table

na(n)
15
210
318
434
568
6136
7268
8528
91048
102088
114160
128288
1316528
1432992
1565888
16131616
17262976
18525568
191050560
202100224
214199040
228395904
2316788480
2433571840
2567135744
26134259200
27268499456
28536969728
291073894400
302147719168
314295330816

[5,10,18,34,68,136,268,528,1048,2088,4160,8288,
 16528,32992,65888,131616,262976,525568,1050560,
 2100224,4199040,8395904,16788480,33571840,
 67135744,134259200,268499456,536969728,1073894400,
 2147719168,4295330816]