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A297708 as a simple table

na(n)
01
11
22
36
414
546
6132
7444
81452
95164
1018680
1171080
12278920
131135624
144774448
1520692560
1692381072
17423566224
181994458656
199619233888
2047516407008
21239904464608
221237764055616
236515682543040
2434984350444736
25191360856810688
261065970229647232
276041353305197184

[1,1,2,6,14,46,132,444,1452,5164,18680,71080,
 278920,1135624,4774448,20692560,92381072,
 423566224,1994458656,9619233888,47516407008,
 239904464608,1237764055616,6515682543040,
 34984350444736,191360856810688,1065970229647232,
 6041353305197184]