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A026552
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Triangular array T read by rows: T(i,0)=T(i,2i)=1 for i >= 0, T(i,1)=T(i,2i-1)=[ i/2 + 1 ] for i >= 1, for even n >= 2, T(i,j)=T(i-1,j-2)+T(i-1,j-1)+T(i-1,j) for 2<=j<=2i-2, for odd n >= 3, T(i,j)=T(i-1,j-2)+T(i-1,j) for 2<=j<=2i-2.
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20
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1, 1, 1, 1, 1, 2, 3, 2, 1, 1, 2, 4, 4, 4, 2, 1, 1, 3, 7, 10, 12, 10, 7, 3, 1, 1, 3, 8, 13, 19, 20, 19, 13, 8, 3, 1, 1, 4, 12, 24, 40, 52, 58, 52, 40, 24, 12, 4, 1, 1, 4, 13, 28, 52, 76, 98, 104, 98, 76, 52, 28, 13, 4, 1, 1, 5, 18, 45, 93, 156, 226, 278
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