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A221478 as a simple table

na(n)
10
28
350
4313
51980
612494
778880
8497940
93143384
1019843336
11125265720
12790768832
134991910856
1431512587760
15198930468440
161255794385648
177927491165000
1850044112904464
19315914982635800
201994286049109040
2112589389751704584

[0,8,50,313,1980,12494,78880,497940,3143384,
 19843336,125265720,790768832,4991910856,
 31512587760,198930468440,1255794385648,
 7927491165000,50044112904464,315914982635800,
 1994286049109040,12589389751704584]