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A000894 as a simple table

na(n)
01
16
260
3700
48820
5116424
61585584
722084920
8312869700
94491418360
1065166397296
11953799087696
1214062422446800
13208618354980000
143111393751416000
1546619049708716400
16701342468412012900

[1,6,60,700,8820,116424,1585584,22084920,
 312869700,4491418360,65166397296,953799087696,
 14062422446800,208618354980000,3111393751416000,
 46619049708716400,701342468412012900]