A267225 - OEIS

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A267225 as a simple table

n	a(n)
1	2
2	9
3	54
4	470
5	5375
6	76237
7	1291052
8	25415028
9	570177387
10	14358031083
11	400970609974
12	12297528376718
13	410864493836407
14	14852560618944921
15	577574220388332600
16	24040616483779262824
17	1066403330800172463507

[2,9,54,470,5375,76237,1291052,25415028,570177387, 14358031083,400970609974,12297528376718, 410864493836407,14852560618944921, 577574220388332600,24040616483779262824, 1066403330800172463507]