A265468 - OEIS

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A265468 as a simple table

n	a(n)
1	3
2	18
3	550
4	8812
5	121819
6	1630672
7	25855219
8	424583341
9	6156035722
10	81100545451
11	1085691306969
12	15448761192453
13	220590548331594
14	3019299007029137
15	40274017206212359
16	543481982379488630
17	7470599265675871603

[3,18,550,8812,121819,1630672,25855219,424583341, 6156035722,81100545451,1085691306969, 15448761192453,220590548331594,3019299007029137, 40274017206212359,543481982379488630, 7470599265675871603]