A252209 - OEIS

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A252209 as a simple table

n	a(n)
1	278710
2	2568954
3	65275092
4	301990806
5	10519316686
6	267361717782
7	1236950586236
8	43087111929354
9	1095113581291852
10	5066549580829014
11	176484810397704526
12	4485585228861223254
13	20752587082923540860

[278710,2568954,65275092,301990806,10519316686, 267361717782,1236950586236,43087111929354, 1095113581291852,5066549580829014, 176484810397704526,4485585228861223254, 20752587082923540860]