A274180 - OEIS

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A274180 as a simple table

n	a(n)
0	1
1	31
2	341
3	6483
4	69905
5	2027247
6	21041413
7	417263459
8	4311810305
9	133666119455
10	1461703693397
11	27806864656979
12	299071474565137
13	8708265758097903
14	90161415181374469
15	1785159701350222947
16	18447025552981295105

[1,31,341,6483,69905,2027247,21041413,417263459, 4311810305,133666119455,1461703693397, 27806864656979,299071474565137,8708265758097903, 90161415181374469,1785159701350222947, 18447025552981295105]