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A304468 as a simple table

na(n)
18
249
3117
4322
51100
62957
78254
826698
977788
10221123
11681855
122041108
135932703
1417889612
1553854606
16158987996
17475744589
181430898909
194260906900
2012733223515
2138231707572
22114317071912
23341873189152
241025366065205
253071359996945

[8,49,117,322,1100,2957,8254,26698,77788,221123,
 681855,2041108,5932703,17889612,53854606,
 158987996,475744589,1430898909,4260906900,
 12733223515,38231707572,114317071912,341873189152,
 1025366065205,3071359996945]