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A300975 as a simple table

na(n)
01
11
23
310
435
5126
6462
71716
86443
924391
1092928
11355862
121368458
135280744
1420438148
1579302960
16308385355
171201536286
184689450021
1918330233110
2071747534460
21281177705490
221103163479190
234332522733560
2417031238725410
2567007449610751
26263841039245280
271039628691988795

[1,1,3,10,35,126,462,1716,6443,24391,92928,355862,
 1368458,5280744,20438148,79302960,308385355,
 1201536286,4689450021,18330233110,71747534460,
 281177705490,1103163479190,4332522733560,
 17031238725410,67007449610751,263841039245280,
 1039628691988795]