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A015531 as a simple table

na(n)
00
11
24
321
4104
5521
62604
713021
865104
9325521
101627604
118138021
1240690104
13203450521
141017252604
155086263021
1625431315104
17127156575521
18635782877604
193178914388021
2015894571940104
2179472859700521

[0,1,4,21,104,521,2604,13021,65104,325521,1627604,
 8138021,40690104,203450521,1017252604,5086263021,
 25431315104,127156575521,635782877604,
 3178914388021,15894571940104,79472859700521]