Omit first term of A160458 and divide by 5.

Terms

a(0) =2a(1) =13a(2) =66a(3) =286a(4) =1102a(5) =3879a(6) =12688a(7) =39050a(8) =114114a(9) =318863a(10) =856654a(11) =2222688a(12) =5589916a(13) =13668072a(14) =32576016a(15) =75845402a(16) =172830788a(17) =386088741a(18) =846744800a(19) =1825447086a(20) =3872819904a(21) =8094022001a(22) =16679126516a(23) =33916289400a(24) =68106769602a(25) =135148379654a(26) =265177195950