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A274553 as a simple table

na(n)
19
256
3368
4780
5836
62352
711096
817816
945356
1077744
1191388
12128768
13254012
14388076
15430272
162087936
172291936
1813174976
1929465852
2035021696
2145335936
22120888092
23184773312
24260378492
25381236216
26775397948
273381872252
284856970752
296800228816
308589344768
3144257207676
32114141404156
331461083549696
341471763808896
352199013818368

[9,56,368,780,836,2352,11096,17816,45356,77744,
 91388,128768,254012,388076,430272,2087936,2291936,
 13174976,29465852,35021696,45335936,120888092,
 184773312,260378492,381236216,775397948,
 3381872252,4856970752,6800228816,8589344768,
 44257207676,114141404156,1461083549696,
 1471763808896,2199013818368]