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A001449 as a simple table

na(n)
01
15
245
3455
44845
553130
6593775
76724520
876904685
9886163135
1010272278170
11119653565850
121399358844975
1316421073515280
14193253756909160
152280012686716080
1626958221130508525

[1,5,45,455,4845,53130,593775,6724520,76904685,
 886163135,10272278170,119653565850,1399358844975,
 16421073515280,193253756909160,2280012686716080,
 26958221130508525]