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A265875 as a simple table

na(n)
15
2137
31330
430363
5544092
69831410
7185555660
83446658882
964319089694
101199098819080
1122364131445571
12417190960294802
137779917972805386
14145112215710497400
152706516080784304796
1650479139484195509572

[5,137,1330,30363,544092,9831410,185555660,
 3446658882,64319089694,1199098819080,
 22364131445571,417190960294802,7779917972805386,
 145112215710497400,2706516080784304796,
 50479139484195509572]