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A249753 as a simple table

na(n)
01
13
27
317
440
599
6246
7642
81690
94554
1012436
1134132
1295230
13263934
14744956
152075132
165892430
1716456014
1846871196
19131068572
20373897870
211046231694
222986898716
238360588572
2423878057870
2566847653774
26190955945756
27534633021212
281527373517710
294276471354254

[1,3,7,17,40,99,246,642,1690,4554,12436,34132,
 95230,263934,744956,2075132,5892430,16456014,
 46871196,131068572,373897870,1046231694,
 2986898716,8360588572,23878057870,66847653774,
 190955945756,534633021212,1527373517710,
 4276471354254]