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A026995 as a simple table

na(n)
01
13
28
320
454
5147
6368
7873
82150
95401
1012948
1129952
1271386
13173370
14406720
15928013
162173248
175178906
1811994740
1927138972
2062859236
21147973950
22339831168
23764579850
241757600988
254102109109
269364407584
2720984799649

[1,3,8,20,54,147,368,873,2150,5401,12948,29952,
 71386,173370,406720,928013,2173248,5178906,
 11994740,27138972,62859236,147973950,339831168,
 764579850,1757600988,4102109109,9364407584,
 20984799649]