A trisection of A001405 (central binomial coefficients): binomial(3*n,floor(3*n/2)), n >= 0.

A187442

A trisection of A001405 (central binomial coefficients): binomial(3*n,floor(3*n/2)), n >= 0.

Terms

    a(0) =1a(1) =3a(2) =20a(3) =126a(4) =924a(5) =6435a(6) =48620a(7) =352716a(8) =2704156a(9) =20058300a(10) =155117520a(11) =1166803110a(12) =9075135300a(13) =68923264410a(14) =538257874440

External references