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A145766 as a simple table

na(n)
00
12
212
354
4224
5906
63636
714558
858248
9233010
10932060
113728262
1214913072
1359652314
14238609284
15954437166
163817748696
1715270994818
1861083979308
19244335917270
20977343669120
213909374676522
2215637498706132
2362549994824574

[0,2,12,54,224,906,3636,14558,58248,233010,932060,
 3728262,14913072,59652314,238609284,954437166,
 3817748696,15270994818,61083979308,244335917270,
 977343669120,3909374676522,15637498706132,
 62549994824574]