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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A147951 as a simple table

na(n)
11
22
36
416
574
6304
71424
87946
939908
10223514
111294348
128736910
1358707788
14401926462
153287231046
1625868828516

[1,2,6,16,74,304,1424,7946,39908,223514,1294348,
 8736910,58707788,401926462,3287231046,25868828516]