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A004146 as a simple table

na(n)
00
11
25
316
445
5121
6320
7841
82205
95776
1015125
1139601
12103680
13271441
14710645
151860496
164870845
1712752041
1833385280
1987403801
20228826125
21599074576
221568397605
234106118241
2410749957120
2528143753121
2673681302245

[0,1,5,16,45,121,320,841,2205,5776,15125,39601,
 103680,271441,710645,1860496,4870845,12752041,
 33385280,87403801,228826125,599074576,1568397605,
 4106118241,10749957120,28143753121,73681302245]