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A189318 as a simple table

na(n)
05
15
225
365
4225
5705
62305
77425
824065
977825
10251905
11815105
122637825
138536065
1427623425
1589391105
16289275905
17936116225
183029336065
199803137025
2031723618305
21102659784705
22332214042625
231075067224065
243478990618625
2511258250133505

[5,5,25,65,225,705,2305,7425,24065,77825,251905,
 815105,2637825,8536065,27623425,89391105,
 289275905,936116225,3029336065,9803137025,
 31723618305,102659784705,332214042625,
 1075067224065,3478990618625,11258250133505]