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A135401 as a simple table

na(n)
01
11
22
32
46
56
620
720
876
976
10312
11312
121384
131384
146512
156512
1632400
1732400
18168992
19168992
20921184
21921184
225222208
235222208
2430710464
2530710464
26186753920
27186753920
281171979904
291171979904
307573069568
317573069568
3250305536256
3350305536256
34342949298688

[1,1,2,2,6,6,20,20,76,76,312,312,1384,1384,6512,
 6512,32400,32400,168992,168992,921184,921184,
 5222208,5222208,30710464,30710464,186753920,
 186753920,1171979904,1171979904,7573069568,
 7573069568,50305536256,50305536256,342949298688]