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A038749 as a simple table

na(n)
10
20
30
42
516
696
7510
82558
912282
1057498
11263421
121192480
135330078
1423657520
15104106655
16455993276
171984733843
188609546380
1937164674383

[0,0,0,2,16,96,510,2558,12282,57498,263421,
 1192480,5330078,23657520,104106655,455993276,
 1984733843,8609546380,37164674383]