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A145643 as a simple table

na(n)
11
22
33
41
515
66
7105
86
935
1060
11385
1290
135005
141260
1575075
16315
171276275
18210
1924249225
20525
21509233725
2211550
2311712375675
2434650
252342475135
26900900
272342475135
283153150
2967931778915
3028028
312105885146365
3214014
332573859623335

[1,2,3,1,15,6,105,6,35,60,385,90,5005,1260,75075,
 315,1276275,210,24249225,525,509233725,11550,
 11712375675,34650,2342475135,900900,2342475135,
 3153150,67931778915,28028,2105885146365,14014,
 2573859623335]