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A147950 as a simple table

na(n)
11
22
36
416
596
6376
71924
810496
984546
10512596
113408402
1227126934
13264217136
142142601474
1518260309986
16185609885490

[1,2,6,16,96,376,1924,10496,84546,512596,3408402,
 27126934,264217136,2142601474,18260309986,
 185609885490]