A transform of the central binomial coefficients.

Terms

a(0) =1a(1) =2a(2) =6a(3) =16a(4) =46a(5) =132a(6) =388a(7) =1152a(8) =3462a(9) =10492a(10) =32036a(11) =98400a(12) =303756a(13) =941576a(14) =2928936a(15) =9138176a(16) =28584006a(17) =89609196a(18) =281466916a(19) =885620576a(20) =2790812196a(21) =8806560056a(22) =27823745016a(23) =88005102336a(24) =278637450396a(25) =883024243032