Triangle of coefficients in expansion of (4+7x)^n.

Terms

a(0) =1a(1) =4a(2) =7a(3) =16a(4) =56a(5) =49a(6) =64a(7) =336a(8) =588a(9) =343a(10) =256a(11) =1792a(12) =4704a(13) =5488a(14) =2401a(15) =1024a(16) =8960a(17) =31360a(18) =54880a(19) =48020a(20) =16807a(21) =4096a(22) =43008a(23) =188160a(24) =439040a(25) =576240a(26) =403368a(27) =117649a(28) =16384a(29) =200704