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A275267 as a simple table

na(n)
15
224
3128
4688
53728
620224
7109760
8595744
93233600
1017551552
1195267648
12517101184
132806762496
1415234766720
1582692468224
16448844700928
172436274668800
1813223803801600
1971777205266432
20389597975982592
212114690622553088

[5,24,128,688,3728,20224,109760,595744,3233600,
 17551552,95267648,517101184,2806762496,
 15234766720,82692468224,448844700928,
 2436274668800,13223803801600,71777205266432,
 389597975982592,2114690622553088]