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A249056 as a simple table

na(n)
01
11
215
335
43780
59504
62702700
77001280
83809332800
910027987200
108896257216000
1123655956688000
1231072794873120000
1383196255098880000
14151687572109032960000
15408177466766125056000
16986280987631626086400000
172664118997179074699264000

[1,1,15,35,3780,9504,2702700,7001280,3809332800,
 10027987200,8896257216000,23655956688000,
 31072794873120000,83196255098880000,
 151687572109032960000,408177466766125056000,
 986280987631626086400000,
 2664118997179074699264000]