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A015551 as a simple table

na(n)
00
11
26
341
4276
51861
612546
784581
8570216
93844201
1025916286
11174718721
121177893756
137940956141
1453535205626
15360916014461
162433172114896
1716403612761681
18110587537144566
19745543286675801
205026197405777636

[0,1,6,41,276,1861,12546,84581,570216,3844201,
 25916286,174718721,1177893756,7940956141,
 53535205626,360916014461,2433172114896,
 16403612761681,110587537144566,745543286675801,
 5026197405777636]