Number of n-digit prime quadruplets.

Terms

a(0) =1a(1) =3a(2) =7a(3) =26a(4) =128a(5) =733a(6) =3869a(7) =23620a(8) =152141a(9) =1028789a(10) =7188960a(11) =51672312a(12) =381226246a(13) =2873279651