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A278549 as a simple table

n a(n)
1 4
2 1531
3 124564
4 6207774
5 256173362
6 9647190761
7 327443433750
8 9777854836324
9 255595250091256
10 5894080544358413
11 121339401663068582
12 2256920347962876651
13 38335567041339845608
14 600100691863091778854
15 8724164918493189698726

[4,1531,124564,6207774,256173362,9647190761,
 327443433750,9777854836324,255595250091256,
 5894080544358413,121339401663068582,
 2256920347962876651,38335567041339845608,
 600100691863091778854,8724164918493189698726]

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Last modified December 4 15:14 EST 2021. Contains 349526 sequences. (Running on oeis4.)