A251033 - OEIS

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A251033 as a simple table

n	a(n)
1	21720
2	308423
3	3433899
4	32439684
5	279055227
6	2247957615
7	17355955112
8	130154155397
9	957718964643
10	6961339210825
11	50231364173275
12	361033974954169
13	2590903481902197
14	18593763503880057
15	133579469806293855

[21720,308423,3433899,32439684,279055227, 2247957615,17355955112,130154155397,957718964643, 6961339210825,50231364173275,361033974954169, 2590903481902197,18593763503880057, 133579469806293855]