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A000266 as a simple table

na(n)
01
11
21
33
415
575
6435
73045
824465
9220185
102200905
1124209955
12290529855
133776888115
1452876298475
15793144477125
1612690313661025
17215735332237425
183883235945814225
1973781482970470275
201475629660064134575
2130988222861346826075
22681740902935880863075

[1,1,1,3,15,75,435,3045,24465,220185,2200905,
 24209955,290529855,3776888115,52876298475,
 793144477125,12690313661025,215735332237425,
 3883235945814225,73781482970470275,
 1475629660064134575,30988222861346826075,
 681740902935880863075]