A378802 a(n) = n * binomial(4*n, n).
0, 4, 56, 660, 7280, 77520, 807576, 8288280, 84146400, 847289520, 8476605280, 84362730452, 836022413616, 8255176274800, 81266247493200, 797911337890800, 7816430993273280, 76417576884236016, 745777615780501920, 7266758081613043600, 70706322844243486400, 687103929058903836480
Offset: 0
Links
- Amiram Eldar, Table of n, a(n) for n = 0..500
- Necdet Batir and Anthony Sofo, On some series involving reciprocals of binomial coefficients, Appl. Math. Comp., Vol. 220 (2013), pp. 331-338.
Programs
-
Mathematica
a[n_] := n * Binomial[4*n, n]; Array[a, 25, 0]
-
PARI
a(n) = n * binomial(4*n, n);