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A047128 as a simple table

na(n)
01
14
215
356
4211
5798
63030
711550
844193
9169652
10653158
112521038
129752516
1337802636
14146792136
15570924940
162223730395
178672669484
1833864089798
19132372227670
20517947357111
212028479976186
227950990968079
2331189593428478

[1,4,15,56,211,798,3030,11550,44193,169652,653158,
 2521038,9752516,37802636,146792136,570924940,
 2223730395,8672669484,33864089798,132372227670,
 517947357111,2028479976186,7950990968079,
 31189593428478]