Walsh matrix of order 8*(1,−2,−2,4,−2,4,4,−8)T{\displaystyle (1,-2,-2,4,-2,4,4,-8)^{T}}
=(−1,3,3,−9,3,−9,−9,27)T{\displaystyle (-1,3,3,-9,3,-9,-9,27)^{T}}
Positive numbers are green, negatives red.

1,-2,-2,4,-2,4,4,-8... is the beginning of Gould's sequence ( A001316),
with the minus signs distributed like the ones in Thue–Morse sequence ( A01006).
(Gould's-Morse sequence)

-1,3,3,-9,3,-9,-9,27... is the beginning of  A048883,
with the minus signs distributed like the zeros in Thue–Morse sequence.
Own work
WatchduckYou can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck".