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A023004 as a simple table

na(n)
01
15
220
365
4190
5506
61265
72990
86765
914725
1031027
1163505
12126730
13247170
14472295
15885723
161633000
172963840
185302075
199358470
2016313440
2128107365
2247902010
2380803485
24134992865
25223474667
26366772720
27597049255
28964375855
291546208695
302461649861
313892774130

[1,5,20,65,190,506,1265,2990,6765,14725,31027,
 63505,126730,247170,472295,885723,1633000,2963840,
 5302075,9358470,16313440,28107365,47902010,
 80803485,134992865,223474667,366772720,597049255,
 964375855,1546208695,2461649861,3892774130]