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A000475 as a simple table

na(n)
41
50
615
770
8630
95544
1055650
11611820
127342335
1395449640
141336295961
1520044438050
16320711010620
175452087178160
1898137569209940
191864613814984984
2037292276299704525
21783137802293789040
2217229031650463366195
23396267727960657413630

[1,0,15,70,630,5544,55650,611820,7342335,95449640,
 1336295961,20044438050,320711010620,5452087178160,
 98137569209940,1864613814984984,37292276299704525,
 783137802293789040,17229031650463366195,
 396267727960657413630]