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A153197 as a simple table

na(n)
01
12
25
315
451
5189
6748
73128
813731
962969
10300552
111488704
127634723
1340464741
14221311617
151247444859
167238458309
1743196661875
18264878725516
191667564565616
2010770316016557
2171314258947903
22483765644021787
233359905164274725

[1,2,5,15,51,189,748,3128,13731,62969,300552,
 1488704,7634723,40464741,221311617,1247444859,
 7238458309,43196661875,264878725516,1667564565616,
 10770316016557,71314258947903,483765644021787,
 3359905164274725]