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A187548 as a simple table

na(n)
01
12
264
32436
4131824
59203264
6787735648
779884060128
89366719620672
91246887723480128
10185786630586649792
1130635253866287585088
125538860010787064796352
131089574788981508858403648
14231683608824013918904796352
1552954849085008593516185123648

[1,2,64,2436,131824,9203264,787735648,79884060128,
 9366719620672,1246887723480128,185786630586649792,
 30635253866287585088,5538860010787064796352,
 1089574788981508858403648,
 231683608824013918904796352,
 52954849085008593516185123648]