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A277175 as a simple table

na(n)
01
12
25
315
453
5222
61120
76849
850111
9427510
104142900
1144693782
12529276962
136813205468
1494642629984
151410507388421
1622445134308123
17379776665469030
186808016435182620
19128886547350655050
202569493300908367550
2153805226930896987540
221180673761078007109840

[1,2,5,15,53,222,1120,6849,50111,427510,4142900,
 44693782,529276962,6813205468,94642629984,
 1410507388421,22445134308123,379776665469030,
 6808016435182620,128886547350655050,
 2569493300908367550,53805226930896987540,
 1180673761078007109840]