Numerators of partial sums of Catalan numbers scaled by powers of -1/4.

Terms

a(0) =1a(1) =3a(2) =7a(3) =51a(4) =109a(5) =415a(6) =863a(7) =13379a(8) =27473a(9) =107461a(10) =219121a(11) =1723575a(12) =3499153a(13) =13810887a(14) =27956079a(15) =884899683a(16) =1787478201a(17) =7085090409a(18) =14289590493a(19) =113433092349a(20) =228507214803a(21) =907912292457