A189901 - OEIS

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A189901 as a simple table

n	a(n)
1	28
2	784
3	21952
4	372850
5	6442436
6	101895401
7	1518596226
8	22333076803
9	319934642768
10	4537262993168
11	63834288477978
12	892671848458793
13	12444325266903474
14	173027620927389879
15	2402063580660811510

[28,784,21952,372850,6442436,101895401,1518596226, 22333076803,319934642768,4537262993168, 63834288477978,892671848458793,12444325266903474, 173027620927389879,2402063580660811510]