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A251491 as a simple table

na(n)
1236
23456
33456
450576
5186304
650576
7740096
810046784
910046784
10740096
1110830016
12541815424
131996407424
14541815424
1510830016
16158478336
1729219848960
18396684056960
19396684056960
2029219848960
21158478336
222319053056

[236,3456,3456,50576,186304,50576,740096,10046784,
 10046784,740096,10830016,541815424,1996407424,
 541815424,10830016,158478336,29219848960,
 396684056960,396684056960,29219848960,158478336,
 2319053056]