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A221675 as a simple table

n a(n)
1 4
2 139
3 5741
4 229150
5 9062913
6 357398390
7 14082457465
8 554737340774
9 21850499916432
10 860643590653662
11 33898578158279334
12 1335175267629518426
13 52588965509249101477
14 2071337262002534945067
15 81584368108175368557177 

[4,139,5741,229150,9062913,357398390,14082457465,
 554737340774,21850499916432,860643590653662,
 33898578158279334,1335175267629518426,
 52588965509249101477,2071337262002534945067,
 81584368108175368557177]

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Last modified March 20 16:01 EDT 2023. Contains 361384 sequences. (Running on oeis4.)