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A188841 as a simple table

na(n)
1128
2987
33280
47753
515504
628101
747652
876912
9119416
10179630
11263120
12376740
13528840
14729495
15990756
161326924
171754848
182294248
192968064
203802832
214829088
226081801
237600836
249431448
2511624808
2614238562
2717337424
2820993804
2925288472

[128,987,3280,7753,15504,28101,47652,76912,119416,
 179630,263120,376740,528840,729495,990756,1326924,
 1754848,2294248,2968064,3802832,4829088,6081801,
 7600836,9431448,11624808,14238562,17337424,
 20993804,25288472]