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A257633 as a simple table

na(n)
01
16
245
3364
43060
526334
6230230
72035800
818156204
9163011640
101471442973
1113340783196
12121399651100
131108176102180
1410142940735900
1593052749919920
16855420636763836
177877932561061640
1872667580816130436
19671262558647881200
206208770443303347920

[1,6,45,364,3060,26334,230230,2035800,18156204,
 163011640,1471442973,13340783196,121399651100,
 1108176102180,10142940735900,93052749919920,
 855420636763836,7877932561061640,
 72667580816130436,671262558647881200,
 6208770443303347920]