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A249533 as a simple table

na(n)
1240
24120
342400
4263156
51154444
64116620
712297972
832313804
976590192
10167150680
11340541012
12655325864
131200479148
142107926892
153567580824
165846311812
179310701480
1814457811924
1921942849820
2032624138612
2147607833428

[240,4120,42400,263156,1154444,4116620,12297972,
 32313804,76590192,167150680,340541012,655325864,
 1200479148,2107926892,3567580824,5846311812,
 9310701480,14457811924,21942849820,32624138612,
 47607833428]