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A249879 as a simple table

na(n)
140740
2136010
3463880
41599494
55545760
619280050
767100334
8233536170
9815743709
102851383464
119968776923
1234851713656
13121833022602
14425845518315
151488332695880
165204198276461
1718200494366672
1863655428624786

[40740,136010,463880,1599494,5545760,19280050,
 67100334,233536170,815743709,2851383464,
 9968776923,34851713656,121833022602,425845518315,
 1488332695880,5204198276461,18200494366672,
 63655428624786]