a(n) = (n+1)*binomial(n+1,11).

Terms

a(0) =11a(1) =144a(2) =1014a(3) =5096a(4) =20475a(5) =69888a(6) =210392a(7) =572832a(8) =1436058a(9) =3359200a(10) =7407036a(11) =15519504a(12) =31097794a(13) =59907456a(14) =111435000a(15) =200880160a(16) =352023165a(17) =601277040a(18) =1003321410a(19) =1638819000a(20) =2624841765a(21) =4128783360a(22) =6386711760a(23) =9727323840a(24) =14602906500a(25) =21628990656