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A257607 as a simple table

na(n)
01
15
25
325
460
525
6125
7535
8535
9125
10625
114210
127490
134210
14625
153125
1630885
1786110
1886110
1930885
203125
2115625
22216560
23880735
241377760
25880735
26216560
2715625
2878125
291471235
308330745
3118948695
3218948695
338330745
341471235
3578125
36390625
379764910
3874498800
39234897010
40341076510
41234897010
4274498800
439764910
44390625

[1,5,5,25,60,25,125,535,535,125,625,4210,7490,
 4210,625,3125,30885,86110,86110,30885,3125,15625,
 216560,880735,1377760,880735,216560,15625,78125,
 1471235,8330745,18948695,18948695,8330745,1471235,
 78125,390625,9764910,74498800,234897010,341076510,
 234897010,74498800,9764910,390625]