Fourth binomial transform of C(n+2,2).

Terms

a(0) =1a(1) =7a(2) =46a(3) =290a(4) =1775a(5) =10625a(6) =62500a(7) =362500a(8) =2078125a(9) =11796875a(10) =66406250a(11) =371093750a(12) =2060546875a(13) =11376953125a(14) =62500000000a(15) =341796875000