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A286073 as a simple table

na(n)
01
11
21
34
412
560
6340
72280
817220
9151872
101459584
1115624000
12182318400
132316837600
1431596570720
15465582237120
167283287851840
17121620647715840
182149774858183680
1940196871701360640
20790002144844738560
2116364478334463078400
22354458730544573132800

[1,1,1,4,12,60,340,2280,17220,151872,1459584,
 15624000,182318400,2316837600,31596570720,
 465582237120,7283287851840,121620647715840,
 2149774858183680,40196871701360640,
 790002144844738560,16364478334463078400,
 354458730544573132800]