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A255451 as a simple table

na(n)
01
15
221
385
4333
51293
64997
719269
874237
9285885
101100725
114237685
1216314029
1362803821
14241772773
15930737317
163582994525
1713793193757
1853098638101
19204409869525
20786901384973
213029275306957
2211661574029893
2344892686930437
24172820009444029
25665292226131325
262561125574008437
279859372988945461
2837954888549712749

[1,5,21,85,333,1293,4997,19269,74237,285885,
 1100725,4237685,16314029,62803821,241772773,
 930737317,3582994525,13793193757,53098638101,
 204409869525,786901384973,3029275306957,
 11661574029893,44892686930437,172820009444029,
 665292226131325,2561125574008437,9859372988945461,
 37954888549712749]