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A270734 as a simple table

na(n)
01
15
220
364
4260
51092
64288
717288
868896
9277084
101114676
114460992
1217809152
1371255876
14285243920
151140843800

[1,5,20,64,260,1092,4288,17288,68896,277084,
 1114676,4460992,17809152,71255876,285243920,
 1140843800]