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A026972 as a simple table

na(n)
11
26
324
4108
5406
61908
77289
834248
9131766
10623700
112416836
1211487528
1344745468
14213451560
15834897375
163993910416
1715673923910
1875152083716
19295737641768
201420670333640
215603322265428
2226960309526744
23106539505068194
24513309625743600
252031786103702780
269800639852315208

[1,6,24,108,406,1908,7289,34248,131766,623700,
 2416836,11487528,44745468,213451560,834897375,
 3993910416,15673923910,75152083716,295737641768,
 1420670333640,5603322265428,26960309526744,
 106539505068194,513309625743600,2031786103702780,
 9800639852315208]