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A304454 as a simple table

na(n)
00
11
21
32
45
515
651
7191
8773
93338
1015243
1173131
12366815
131916260
1410394665
1558404853
16339223859
172033188222
1812556915219
1979807729238
20521399203037
213497978659977
2224076009827669
23169865542733652
241227553152971419
259079751310622581
2668692742886823205

[0,1,1,2,5,15,51,191,773,3338,15243,73131,366815,
 1916260,10394665,58404853,339223859,2033188222,
 12556915219,79807729238,521399203037,
 3497978659977,24076009827669,169865542733652,
 1227553152971419,9079751310622581,
 68692742886823205]