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A249059 as a simple table

na(n)
01
15
210
340
4110
5430
61420
75720
821340
989980
10367400
111627120
127138120
1333172040
14154520080
15751616800
163687498320
1718719834320
1896157299040
19507993654080
202719611532000
2114911459229920
2282901747529920
23470599687507840
242708946870815680

[1,5,10,40,110,430,1420,5720,21340,89980,367400,
 1627120,7138120,33172040,154520080,751616800,
 3687498320,18719834320,96157299040,507993654080,
 2719611532000,14911459229920,82901747529920,
 470599687507840,2708946870815680]