Third binomial transform of C(n+2,2).

Terms

a(0) =1a(1) =6a(2) =33a(3) =172a(4) =864a(5) =4224a(6) =20224a(7) =95232a(8) =442368a(9) =2031616a(10) =9240576a(11) =41680896a(12) =186646528a(13) =830472192a(14) =3674210304a(15) =16173236224a(16) =70866960384a(17) =309237645312