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A056372 as a simple table

na(n)
13
29
318
454
572
6405
7390
81944
93411
1014985
1117802
12139968
13133104
14798525
151804518
165454378
178072532
1864599849
1964573626
20437732424
21872157294
223138159429
234279259574
2435362084140
2542364514403
26211822562025
27423646166250

[3,9,18,54,72,405,390,1944,3411,14985,17802,
 139968,133104,798525,1804518,5454378,8072532,
 64599849,64573626,437732424,872157294,3138159429,
 4279259574,35362084140,42364514403,211822562025,
 423646166250]