Triangle of sums of Jacobsthal numbers related to binomial(4n,n)/(3n+1) mod 4.

Terms

a(0) =3a(1) =11a(2) =13a(3) =43a(4) =45a(5) =53a(6) =171a(7) =173a(8) =181a(9) =213a(10) =683a(11) =685a(12) =693a(13) =725a(14) =853a(15) =2731a(16) =2733a(17) =2741a(18) =2773a(19) =2901a(20) =3413a(21) =10923a(22) =10925a(23) =10933a(24) =10965a(25) =11093a(26) =11605a(27) =13653a(28) =43691a(29) =43693