Row sums of A099884, the XOR difference triangle of the powers of 2.

Terms

a(0) =1a(1) =5a(2) =15a(3) =45a(4) =107a(5) =265a(6) =615a(7) =1485a(8) =3227a(9) =7225a(10) =15735a(11) =35325a(12) =75019a(13) =163145a(14) =348135a(15) =761805a(16) =1589147a(17) =3374905a(18) =7077495a(19) =15138045a(20) =31390219a(21) =66122825a(22) =137816295a(23) =292344525a(24) =601532059a(25) =1253593145a(26) =2591401335a(27) =5435447805a(28) =11157226763