A226426 - OEIS

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A226426 as a simple table

n	a(n)
1	6
2	88
3	365
4	968
5	2560
6	4932
7	9546
8	16367
9	27678
10	43394
11	67854
12	98326
13	144309
14	200321
15	278115
16	371542
17	499528
18	644096
19	840137
20	1061587
21	1344879

[6,88,365,968,2560,4932,9546,16367,27678,43394, 67854,98326,144309,200321,278115,371542,499528, 644096,840137,1061587,1344879]