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A149756 as a simple table

na(n)
01
11
25
317
485
5329
61645
76913
834565
9152729
10763645
113482097
1217410485
1381061001
14405305005
151914744673
169573723365
1745711939705
18228559698525
191100105774033
205500528870165
2126640170717033
22133200853585165
23648290412642625
243241452063213125
2515838421978898265
2679192109894491325

[1,1,5,17,85,329,1645,6913,34565,152729,763645,
 3482097,17410485,81061001,405305005,1914744673,
 9573723365,45711939705,228559698525,1100105774033,
 5500528870165,26640170717033,133200853585165,
 648290412642625,3241452063213125,
 15838421978898265,79192109894491325]