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A156919 as a simple table

na(n)
01
12
21
34
410
51
68
760
836
91
1016
11296
12516
13116
141
1532
161328
175168
183508
19358
201
2164
225664
2342960
2464240
2521120
261086
271
28128
2923488
30320064
31900560
32660880
33118632
343272
351
36256
3795872
382225728

[1,2,1,4,10,1,8,60,36,1,16,296,516,116,1,32,1328,
 5168,3508,358,1,64,5664,42960,64240,21120,1086,1,
 128,23488,320064,900560,660880,118632,3272,1,256,
 95872,2225728]