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A037952 as a simple table

na(n)
00
11
21
33
44
510
615
735
856
9126
10210
11462
12792
131716
143003
156435
1611440
1724310
1843758
1992378
20167960
21352716
22646646
231352078
242496144
255200300
269657700
2720058300
2837442160
2977558760
30145422675
31300540195
32565722720
331166803110
342203961430
354537567650

[0,1,1,3,4,10,15,35,56,126,210,462,792,1716,3003,
 6435,11440,24310,43758,92378,167960,352716,646646,
 1352078,2496144,5200300,9657700,20058300,37442160,
 77558760,145422675,300540195,565722720,1166803110,
 2203961430,4537567650]