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A152881 as a simple table

na(n)
10
21
35
415
540
695
7213
8455
9940
101890
113720
127194
1313710
1425805
1548055
1688665
17162272
18294865
19532395
20955795
211707110
223034836
235372400
249473700
2516646700
2629155225
2750908793
2888644915
29153952120
30266726195
31461066385
32795320159

[0,1,5,15,40,95,213,455,940,1890,3720,7194,13710,
 25805,48055,88665,162272,294865,532395,955795,
 1707110,3034836,5372400,9473700,16646700,29155225,
 50908793,88644915,153952120,266726195,461066385,
 795320159]