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A055747 as a simple table

na(n)
01
10
20
356
4606
50
60
727456
8123156
90
100
113745512
129217112
130
140
1595209152
16188066718
170
180
191144371624
201960489800
210
220
238505838656
2413289979912
250
260
2745755357024
2867080028224
290
300
31195411318912
32272570040468
330
340

[1,0,0,56,606,0,0,27456,123156,0,0,3745512,
 9217112,0,0,95209152,188066718,0,0,1144371624,
 1960489800,0,0,8505838656,13289979912,0,0,
 45755357024,67080028224,0,0,195411318912,
 272570040468,0,0]