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A186266 as a simple table

na(n)
01
13
218
3140
41260
512474
6132132
71472328
817065620
9204155380
102506399896
1131443925968
12401783498480
135215458874500
1468633685693000
15914099013896400
1612304253831789700
17167193096184907100
182291164651422801000
1931637804708163654000
20439903041116118980400

[1,3,18,140,1260,12474,132132,1472328,17065620,
 204155380,2506399896,31443925968,401783498480,
 5215458874500,68633685693000,914099013896400,
 12304253831789700,167193096184907100,
 2291164651422801000,31637804708163654000,
 439903041116118980400]