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A111976 as a simple table

na(n)
01
11
21
34
416
596
6896
713568
8345088
915112192
101159913472
11158164664320
1238737429987328
1317197276791701504
1413946909814794223616
1520801835304287183306752
1657394078732651064041930752

[1,1,1,4,16,96,896,13568,345088,15112192,
 1159913472,158164664320,38737429987328,
 17197276791701504,13946909814794223616,
 20801835304287183306752,
 57394078732651064041930752]