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A026991 as a simple table

na(n)
01
12
26
320
498
5502
62126
78382
839624
9203562
10922944
113886840
1218431462
1393930404
14435553556
151893481706
169028569112
1745794495192
18214665970468
19950426429104
204550599324520
2123012148707800
22108579819367298
23486522336711212
242336288831626038
2511788749319436714

[1,2,6,20,98,502,2126,8382,39624,203562,922944,
 3886840,18431462,93930404,435553556,1893481706,
 9028569112,45794495192,214665970468,950426429104,
 4550599324520,23012148707800,108579819367298,
 486522336711212,2336288831626038,
 11788749319436714]