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A290720 as a simple table

n a(n)
0 3
1 13
2 40
3 127
4 430
5 1525
6 5572
7 20779
8 78682
9 301537
10 1166704
11 4548631
12 17840134
13 70297549
14 278001436
15 1102439683
16 4381060786
17 17438149561
18 69494317768
19 277202429935
20 1106485196638
21 4418967217573
22 17654948163700
23 70557030535387
24 282039835783690
25 1127594484061585

[3,13,40,127,430,1525,5572,20779,78682,301537,
 1166704,4548631,17840134,70297549,278001436,
 1102439683,4381060786,17438149561,69494317768,
 277202429935,1106485196638,4418967217573,
 17654948163700,70557030535387,282039835783690,
 1127594484061585]

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Last modified October 20 15:29 EDT 2019. Contains 328267 sequences. (Running on oeis4.)