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A278464 as a simple table

na(n)
00
11
25
317
453
5145
6385
7957
82333
95493
1012741
1128941
1265049
13144225
14317229
15691457
161497901
173224145
186906969
1914726701
2031282421
2166211253
22139720445
23294007373
24617154865
251292516577
262701451621
275635565761
2811736442005
2924403092657
3050666528209

[0,1,5,17,53,145,385,957,2333,5493,12741,28941,
 65049,144225,317229,691457,1497901,3224145,
 6906969,14726701,31282421,66211253,139720445,
 294007373,617154865,1292516577,2701451621,
 5635565761,11736442005,24403092657,50666528209]