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A270186 as a simple table

na(n)
01
15
224
3108
4436
51368
64688
718508
873096
9289004
101164032
114650292
1218637520
1374544520
14298334196
151193353884

[1,5,24,108,436,1368,4688,18508,73096,289004,
 1164032,4650292,18637520,74544520,298334196,
 1193353884]