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A027980 as a simple table

n a(n)
0 1
1 13
2 48
3 176
4 580
5 1844
6 5667
7 17047
8 50404
9 147090
10 424686
11 1215528
12 3453733
13 9752641
14 27393240
15 76587284
16 213260152
17 591707612
18 1636514439
19 4513276555
20 12414985996
21 34071252918
22 93305816418
23 255027755856
24 695815086025
25 1895348847349
26 5154987856512
27 14000952578552

[1,13,48,176,580,1844,5667,17047,50404,147090,
 424686,1215528,3453733,9752641,27393240,76587284,
 213260152,591707612,1636514439,4513276555,
 12414985996,34071252918,93305816418,255027755856,
 695815086025,1895348847349,5154987856512,
 14000952578552]

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Last modified June 23 18:45 EDT 2021. Contains 345402 sequences. (Running on oeis4.)