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A249638 as a simple table

na(n)
00
10
25
345
4245
51305
66605
733405
8167405
9838845
104196045
1120989245
12104955245
13524820945
142624149445
1513120970445
1665605075445
17328026491505
181640133571805
198200673428605
2041003372712605
21205016891401905
221025084484848405
235125422563427405

[0,0,5,45,245,1305,6605,33405,167405,838845,
 4196045,20989245,104955245,524820945,2624149445,
 13120970445,65605075445,328026491505,
 1640133571805,8200673428605,41003372712605,
 205016891401905,1025084484848405,5125422563427405]