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A176950 as a simple table

na(n)
11
21
32
46
519
664
7223
8799
92927
1010922
1141382
12158800
13615939
142410880
159510650
1637774357
17150929671
18606239784
192446566976
209915210221
2140336587662
22164662328192
23674300310836
242769234827610
2511402791485018
2647067085053193

[1,1,2,6,19,64,223,799,2927,10922,41382,158800,
 615939,2410880,9510650,37774357,150929671,
 606239784,2446566976,9915210221,40336587662,
 164662328192,674300310836,2769234827610,
 11402791485018,47067085053193]