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A272954
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Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles right triangle.
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1
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4, 21, 24, 60, 210, 637, 1840, 5792, 18556, 54034, 160246, 499140, 1501706, 4627363, 13954490, 43064736, 131174878, 399170874, 1222825766, 3739040310, 11456400210, 35068696769, 107362206600, 329271410590, 1009129910706, 3096269613087
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