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A037956 as a simple table

na(n)
00
10
20
30
41
51
66
77
828
936
10120
11165
12495
13715
142002
153003
168008
1712376
1831824
1950388
20125970
21203490
22497420
23817190
241961256
253268760
267726160
2713037895
2830421755
2951895935
30119759850
31206253075

[0,0,0,0,1,1,6,7,28,36,120,165,495,715,2002,3003,
 8008,12376,31824,50388,125970,203490,497420,
 817190,1961256,3268760,7726160,13037895,30421755,
 51895935,119759850,206253075]