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A255474 as a simple table

na(n)
01
16
224
388
4336
51280
64928
719072
874240
9290304
101139712
114489216
1217731584
1370197248
14278429696
151106083840
164399628288
1717518559232
1869815500800
19278424715264
201110989340672
214435189170176
2217712382214144
2370757707153408
24282733687341056
251129973180006400

[1,6,24,88,336,1280,4928,19072,74240,290304,
 1139712,4489216,17731584,70197248,278429696,
 1106083840,4399628288,17518559232,69815500800,
 278424715264,1110989340672,4435189170176,
 17712382214144,70757707153408,282733687341056,
 1129973180006400]