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A368318 as a simple table

na(n)
01
12
25
316
462
5264
61170
75310
824599
9116090
10556569
112703098
1213268900
1365721840
14328050639
151648535856
168333536002
1742348587700
18216211838178
191108514508608
205704874555112
2129460504457692
22152612723209700
23792833380805160
244129639139612133

[1,2,5,16,62,264,1170,5310,24599,116090,556569,
 2703098,13268900,65721840,328050639,1648535856,
 8333536002,42348587700,216211838178,1108514508608,
 5704874555112,29460504457692,152612723209700,
 792833380805160,4129639139612133]