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A033543 as a simple table

na(n)
01
12
25
316
462
5270
61257
76096
830398
9154756
10800834
114199720
1222269976
13119207942
14643277553
153495713184
1619113486390
17105074982876
18580435709622
193220217022144
2017935186513044
21100243540330188
22562080274898250
233160904659483104
2417823384503589996
25100749266778698280

[1,2,5,16,62,270,1257,6096,30398,154756,800834,
 4199720,22269976,119207942,643277553,3495713184,
 19113486390,105074982876,580435709622,
 3220217022144,17935186513044,100243540330188,
 562080274898250,3160904659483104,
 17823384503589996,100749266778698280]