

A183942


Number of strings of n numbers x(i) in 7..7 with sums of x(i) and of x(i)*x(i+1) both zero


0



1, 1, 15, 57, 1033, 6259, 80851, 844829, 10894795, 130817901, 1781556515, 23640849007, 329173058411, 4518115025537, 63025886167079
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