Walsh matrix of order 16*(1,−2,−2,4,−2,4,4,−8,−2,4,4,−8,4,−8,−8,16)T{\displaystyle (1,-2,-2,4,-2,4,4,-8,-2,4,4,-8,4,-8,-8,16)^{T}}
=(1,−3,−3,9,−3,9,9,−27,−3,9,9,−27,9,−27,−27,81)T{\displaystyle (1,-3,-3,9,-3,9,9,-27,-3,9,9,-27,9,-27,-27,81)^{T}}
Positive numbers are green, negatives red.

1,-2,-2,4,-2,4,4,-8,-2,4,4,-8,4,-8,-8,16... is the beginning of Gould's sequence ( A001316),
with the minus signs distributed like the ones in Thue–Morse sequence ( A01006)
1,-3,-3,9,-3,9,9,-27,-3,9,9,-27,9,-27,-27,81... is the beginning of  A048883,
with the minus signs distributed like the ones in Thue–Morse sequence.
Own work
WatchduckYou can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck".