The Gi4 sums of the Pell-Jacobsthal triangle A013609.

Terms

a(0) =1a(1) =3a(2) =15a(3) =87a(4) =503a(5) =2871a(6) =16311a(7) =92599a(8) =525751a(9) =2985399a(10) =16952759a(11) =96267703a(12) =546663863a(13) =3104271799a(14) =17627835831a(15) =100100959671a(16) =568430652855