Row sums of number triangle A159971.

Terms

a(0) =1a(1) =-1a(2) =0a(3) =2a(4) =-7a(5) =21a(6) =-63a(7) =195a(8) =-624a(9) =2054a(10) =-6916a(11) =23712a(12) =-82498a(13) =290510a(14) =-1033410a(15) =3707850a(16) =-13402695a(17) =48760365a(18) =-178405155a(19) =656043855a(20) =-2423307045a(21) =8987427465a(22) =-33453694485a(23) =124936258125a(24) =-467995871775