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A051945 as a simple table

na(n)
01
16
222
380
4294
51092
64092
715444
858630
9223652
10856596
113292016
1212688732
1349031400
14189885240
15736808220
162863971270
1711149451940
1843465121700
19169657266240
20662976162420
212593424304120
2210154564564040
2339794915183400
24156078401826204
25612605246582952

[1,6,22,80,294,1092,4092,15444,58630,223652,
 856596,3292016,12688732,49031400,189885240,
 736808220,2863971270,11149451940,43465121700,
 169657266240,662976162420,2593424304120,
 10154564564040,39794915183400,156078401826204,
 612605246582952]