a={'1' '631' '618' '574' '678'}
n=numel(a)
for k=1:n
b{k}=arrayfun(@(x) k:x,k:n,'un',0)
end
c=[b{:}]'
out=cellfun(@(x) a(x),c,'un',0)
out{1}
out{2}
out{3}
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