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A350513 as a simple table

na(n)
13
221
3648
415552
5404595
610812528
7290993472
87849029276
9211855234563
105719493462076
11154420985682648
124169319089851512
13112571188876032435
143039418274650387848
1582064259021919140432
162215734684425617523796
1759824833697843168341123
181615270484817096465311316

[3,21,648,15552,404595,10812528,290993472,
 7849029276,211855234563,5719493462076,
 154420985682648,4169319089851512,
 112571188876032435,3039418274650387848,
 82064259021919140432,2215734684425617523796,
 59824833697843168341123,1615270484817096465311316]