A133345 - OEIS

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A133345 as a simple table

n	a(n)
0	1
1	1
2	16
3	46
4	316
5	1276
6	6976
7	31816
8	161296
9	768016
10	3794176
11	18340576
12	89799616
13	436367296
14	2129929216
15	10369000576
16	50557010176
17	246280028416
18	1200358199296
19	5848636796416
20	28502288382976
21	138885491915776

[1,1,16,46,316,1276,6976,31816,161296,768016, 3794176,18340576,89799616,436367296,2129929216, 10369000576,50557010176,246280028416, 1200358199296,5848636796416,28502288382976, 138885491915776]