A251434 - OEIS

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A251434 as a simple table

n	a(n)
1	240
2	9439
3	127566
4	938895
5	4868362
6	19285211
7	64105154
8	183394583
9	471403286
10	1102425601
11	2401296076
12	4893740761
13	9479843984
14	17499293961
15	31078021378
16	53193428735
17	88367832130
18	142559457359

[240,9439,127566,938895,4868362,19285211,64105154, 183394583,471403286,1102425601,2401296076, 4893740761,9479843984,17499293961,31078021378, 53193428735,88367832130,142559457359]