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A273431 as a simple table

na(n)
01
14
228
3157
4733
53081
612877
751821
8206833
9830405
103325905
1113313637
1253308989
13213158361
14852730457
153411030957

[1,4,28,157,733,3081,12877,51821,206833,830405,
 3325905,13313637,53308989,213158361,852730457,
 3411030957]