A048351 - OEIS

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A048351 as a simple table

n	a(n)
1	4
2	26
3	216
4	1291
5	5164
6	68313
7	163284
8	785294
9	3559026
10	26393686
11	129099069
12	254296413
13	816435342
14	4081257976
15	80413106314
16	215329205326
17	2463064689907
18	5165911014784
19	24832773982716
20	81401883640163

[4,26,216,1291,5164,68313,163284,785294,3559026, 26393686,129099069,254296413,816435342,4081257976, 80413106314,215329205326,2463064689907, 5165911014784,24832773982716,81401883640163]