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A186021 as a simple table

na(n)
01
12
24
310
430
5104
6406
71754
88280
942294
10231950
111357140
128427194
1355288874
14381798644
152765917090
1620960284294
17165729739608
181364153612318
1911665484410114
20103448316470744
21949739632313502
229013431476894646
2388304011710168692
24891917738589610578
259277180664459998706

[1,2,4,10,30,104,406,1754,8280,42294,231950,
 1357140,8427194,55288874,381798644,2765917090,
 20960284294,165729739608,1364153612318,
 11665484410114,103448316470744,949739632313502,
 9013431476894646,88304011710168692,
 891917738589610578,9277180664459998706]