a(1)=1, a(2)=2, a(3)=3, a(4)=4, a(5)=5, a(n)=5*a(n-5)+4*a(n-4)+3*a(n-3)+2*a(n-2)+a(n-1).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =35a(6) =79a(7) =195a(8) =498a(9) =1290a(10) =3362a(11) =8611a(12) =22172a(13) =57130a(14) =147205a(15) =379235a(16) =976778a(17) =2516243a(18) =6481974a(19) =16697759a(20) =43013723a(21) =110804025a(22) =285433859a(23) =735283984a(24) =1894107464a(25) =4879261724a(26) =12569084165a(27) =32378235236a(28) =83407038514a(29) =214858345697