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A037955 as a simple table

na(n)
00
10
21
31
44
55
615
721
856
984
10210
11330
12792
131287
143003
155005
1611440
1719448
1843758
1975582
20167960
21293930
22646646
231144066
242496144
254457400
269657700
2717383860
2837442160
2967863915
30145422675
31265182525
32565722720
331037158320
342203961430
354059928950
368597496600
3715905368710
3833578000610
3962359143990

[0,0,1,1,4,5,15,21,56,84,210,330,792,1287,3003,
 5005,11440,19448,43758,75582,167960,293930,646646,
 1144066,2496144,4457400,9657700,17383860,37442160,
 67863915,145422675,265182525,565722720,1037158320,
 2203961430,4059928950,8597496600,15905368710,
 33578000610,62359143990]