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function(n)cbind(rbind(sapply(1:n-1,function(x)x+1'+',1:n),2*n),2*n)
Try it online!Try it online!
Thanks to @Guiseppe for the pointer for sapply and the 9 bytes
function(n)cbind(rbind(sapply(1:n-1,function(x)x+1:n),2*n),2*n)
Try it online!
function(n)cbind(rbind(sapply(1:n-1,'+',1:n),2*n),2*n)
function(n)cbind(rbind(sapply(1:n-1,function(x)x:(xx+1:x+n-1)n),2*n),2*n)
Might still have a bit of room for golfing.Try it online!
function(n)cbind(rbind(sapply(1:n,function(x)x:(x:x+n-1)),2*n),2*n)
Might still have a bit of room for golfing.
