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M=matrix(repM=replicate(26,c(letters,"\n"),26),nc=26);diag(M)=LETTERS;cat(M,M[,25:1],sep="")
Improved by @MickyT
M=matrix(rep(c(letters,"\n"),26),nc=26);diag(M)=LETTERS;cat(M,M[,25:1],sep="")
M=replicate(26,c(letters,"\n"));diag(M)=LETTERS;cat(M,M[,25:1],sep="")
