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A134931 as a simple table

na(n)
01
16
221
366
4201
5606
61821
75466
816401
949206
10147621
11442866
121328601
133985806
1411957421
1535872266
16107616801
17322850406
18968551221
192905653666
208716961001
2126150883006
2278452649021
23235357947066
24706073841201
252118221523606

[1,6,21,66,201,606,1821,5466,16401,49206,147621,
 442866,1328601,3985806,11957421,35872266,
 107616801,322850406,968551221,2905653666,
 8716961001,26150883006,78452649021,235357947066,
 706073841201,2118221523606]