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A131949 as a simple table

na(n)
01
16
216
332
456
592
6148
7240
8400
9692
101244
112312
124408
138556
1416804
1533248
1666080
17131684
18262828
19525048
201049416
212098076
224195316
238389712
2416778416
2533555732
2667110268
27134219240
28268437080
29536872652
301073743684
312147485632
324294969408
338589936836

[1,6,16,32,56,92,148,240,400,692,1244,2312,4408,
 8556,16804,33248,66080,131684,262828,525048,
 1049416,2098076,4195316,8389712,16778416,33555732,
 67110268,134219240,268437080,536872652,1073743684,
 2147485632,4294969408,8589936836]