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A328533 as a simple table

na(n)
01
14
212
340
4100
5216
6472
7896
81580
92732
104408
116816
1210400
1315280
1422000
1531088
1643308
1758072
1878804
19102176
20134056
21169408
22218320
23268228
24339768
25409244
26507744
27603368
28738000
29859424
301041376
311200664
321435908
331639184
341943224
352186656

[1,4,12,40,100,216,472,896,1580,2732,4408,6816,
 10400,15280,22000,31088,43308,58072,78804,102176,
 134056,169408,218320,268228,339768,409244,507744,
 603368,738000,859424,1041376,1200664,1435908,
 1639184,1943224,2186656]