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A048516
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Array T read by diagonals: T(m,n)=number of subsets S of {1,2,3,...,m+n-1} such that |S|>1 and |a-b|>=m for all distinct a and b in S, m=1,2,3,...; n=1,2,3,...
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0
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0, 0, 1, 0, 4, 1, 0, 11, 3, 1, 0, 26, 7, 3, 1, 0, 57, 14, 6, 3, 1, 0, 120, 26, 11, 6, 3, 1, 0, 247, 46, 19, 10, 6, 3, 1, 0, 502, 79, 31, 16, 10, 6, 3, 1, 0, 1013, 133, 49, 25, 15, 10, 6, 3, 1, 0, 2036, 221, 76, 38, 22, 15, 10, 6, 3, 1, 0, 4083, 364
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