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A001040 as a simple table

na(n)
00
11
21
33
410
543
6225
71393
89976
981201
10740785
117489051
1283120346
131004933203
1413147251985
15185066460993
162789144166880
1744811373131073
18764582487395121
1913807296146243251
20263103209266016890
215275871481466581051
22111056404320064218961
232448516766522879398193

[0,1,1,3,10,43,225,1393,9976,81201,740785,7489051,
 83120346,1004933203,13147251985,185066460993,
 2789144166880,44811373131073,764582487395121,
 13807296146243251,263103209266016890,
 5275871481466581051,111056404320064218961,
 2448516766522879398193]