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A053441 as a simple table

na(n)
21
30
44
54
616
724
871
9128
10328
11650
121552
133232
147437
1515904
1635884
1777840
18173792
19379896
20843411
211851264
224097552
239014038
2419918944
2543871360
2696860441
27213472064
28471086932
291038595100
302291372912
315052682904
3211145821407
3324580005376
3454217564504
35119573069218

[1,0,4,4,16,24,71,128,328,650,1552,3232,7437,
 15904,35884,77840,173792,379896,843411,1851264,
 4097552,9014038,19918944,43871360,96860441,
 213472064,471086932,1038595100,2291372912,
 5052682904,11145821407,24580005376,54217564504,
 119573069218]