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A376981 as a simple table

na(n)
10
20
30
41
52
66
711
832
961
10158
11308
12749
131481
143481
156997
1616086
1732692
1874114
19152114
20341410
21705978
221573062
233273527
247253791

[0,0,0,1,2,6,11,32,61,158,308,749,1481,3481,6997,
 16086,32692,74114,152114,341410,705978,1573062,
 3273527,7253791]