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A087131 as a simple table

na(n)
02
12
212
332
4112
5352
61152
73712
812032
938912
10125952
11407552
121318912
134268032
1413811712
1544695552
16144637952
17468058112
181514668032
194901568512
2015861809152
2151329892352
22166107021312
23537533612032
241739495309312

[2,2,12,32,112,352,1152,3712,12032,38912,125952,
 407552,1318912,4268032,13811712,44695552,
 144637952,468058112,1514668032,4901568512,
 15861809152,51329892352,166107021312,537533612032,
 1739495309312]