A138272 Column 0 of triangle A138271; also, column 3 of A138271 shift left; also, column 0 of matrix power A138271^4 shift right.
1, 1, 4, 28, 268, 3164, 43672, 682632, 11834536, 224283416, 4597330748, 101100605540, 2370095338372, 58924635472260, 1546999678599872, 42734731811302304, 1238309697485975648, 37538075865014728096
Offset: 0