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A297096 as a simple table

na(n)
14
216
358
4216
5808
63016
711264
842080
9157192
10587200
112193552
128194256
1330610528
14114348992
15427163264
161595715392
175960970560
1822267862080
1983184051328
20310743185408
211160815393920
224336353754624
2316198927050240
2460512876123648

[4,16,58,216,808,3016,11264,42080,157192,587200,
 2193552,8194256,30610528,114348992,427163264,
 1595715392,5960970560,22267862080,83184051328,
 310743185408,1160815393920,4336353754624,
 16198927050240,60512876123648]