A118908 - OEIS

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A118908 as a simple table

n	a(n)
1	4
2	15
3	221
4	48839
5	2385247913
6	5689407606470855563
7	32369358912568429679140929317208046943
8	1047775396410673232345014594095988998399127191704501568910205139392491645247

[4,15,221,48839,2385247913,5689407606470855563, 32369358912568429679140929317208046943, 10477753964106732323450145940959889983991271917045\ 01568910205139392491645247]