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A036291 as a simple table

na(n)
00
15
250
3375
42500
515625
693750
7546875
83125000
917578125
1097656250
11537109375
122929687500
1315869140625
1485449218750
15457763671875
162441406250000
1712969970703125
1868664550781250
19362396240234375
201907348632812500
2110013580322265625
2252452087402343750

[0,5,50,375,2500,15625,93750,546875,3125000,
 17578125,97656250,537109375,2929687500,
 15869140625,85449218750,457763671875,
 2441406250000,12969970703125,68664550781250,
 362396240234375,1907348632812500,
 10013580322265625,52452087402343750]