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A054884 as a simple table

na(n)
01
10
25
310
465
5260
61365
76510
832865
9162760
10815365
114069010
1220352865
13101725260
14508665365
152543131510
1612715852865
1763578287760
18317892415365
191589457194010
207947290852865
2139736429850260

[1,0,5,10,65,260,1365,6510,32865,162760,815365,
 4069010,20352865,101725260,508665365,2543131510,
 12715852865,63578287760,317892415365,
 1589457194010,7947290852865,39736429850260]