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A131868 as a simple table

na(n)
11
21
31
42
55
613
735
8100
9300
10925
112915
129386
1330771
14102347
15344705
161173960
174037381
1814004912
1948954659
20172307930
21610269695
222173656683
237782070631
2427992709172
25101128485150
26366803656323
271335349400274
284877991428982

[1,1,1,2,5,13,35,100,300,925,2915,9386,30771,
 102347,344705,1173960,4037381,14004912,48954659,
 172307930,610269695,2173656683,7782070631,
 27992709172,101128485150,366803656323,
 1335349400274,4877991428982]