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A162748 as a simple table

na(n)
01
12
25
314
442
5132
6430
71444
84984
917648
1064024
11237712
12902416
133499680
1413853424
1555931168
16230142848
17964460288
184113656704
1917846729984
2078708574976
21352678567424
221604739694848
237411167960576
2434723660917760

[1,2,5,14,42,132,430,1444,4984,17648,64024,237712,
 902416,3499680,13853424,55931168,230142848,
 964460288,4113656704,17846729984,78708574976,
 352678567424,1604739694848,7411167960576,
 34723660917760]