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A215953 as a simple table

na(n)
11
21
32
44
512
634
7136
8500
92440
1010900
1161912
12322768
132075312
1412297768
1587852160
16580849872
174548247264
1833093252880
19281121815712
202227152575552
2120358402201792
22174131286983712
231701534399324544
2415604440074084672

[1,1,2,4,12,34,136,500,2440,10900,61912,322768,
 2075312,12297768,87852160,580849872,4548247264,
 33093252880,281121815712,2227152575552,
 20358402201792,174131286983712,1701534399324544,
 15604440074084672]