Sum of divisors of Motzkin number A001006(n).

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =13a(5) =32a(6) =72a(7) =128a(8) =360a(9) =1008a(10) =3836a(11) =9408a(12) =15512a(13) =66960a(14) =252720a(15) =785148a(16) =1137960a(17) =3340800a(18) =13072776a(19) =42465024a(20) =69530400a(21) =238761600a(22) =678562560a(23) =2412043920a(24) =5270534880a(25) =10943277120a(26) =44922182340a(27) =117229255200a(28) =209990825568a(29) =623486730240