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A270631 as a simple table

na(n)
01
15
220
360
4312
51236
65132
720308
884836
9348436
101422668
115780620
1223307100
1393611056
14375155196
151502087240

[1,5,20,60,312,1236,5132,20308,84836,348436,
 1422668,5780620,23307100,93611056,375155196,
 1502087240]