A048559 - OEIS

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A048559 as a simple table

n	a(n)
0	4
1	49
2	49284
3	4928461209
4	492846120914204828164
5	4928461209142048281644440027571600000000001
6	49284612091420482816444400275716000000000017667716927194638935286982918857620344809476

[4,49,49284,4928461209,492846120914204828164, 4928461209142048281644440027571600000000001, 49284612091420482816444400275716000000000017667716\ 927194638935286982918857620344809476]