Triangle of coefficients in expansion of (2 + 7*x)^n.

Terms

a(0) =1a(1) =2a(2) =7a(3) =4a(4) =28a(5) =49a(6) =8a(7) =84a(8) =294a(9) =343a(10) =16a(11) =224a(12) =1176a(13) =2744a(14) =2401a(15) =32a(16) =560a(17) =3920a(18) =13720a(19) =24010a(20) =16807a(21) =64a(22) =1344a(23) =11760a(24) =54880a(25) =144060a(26) =201684a(27) =117649a(28) =128a(29) =3136