a(n) = 7^(floor(n/3))*A(n), where A(n) = A(n-1) + A(n-2) + A(n-3)/7, with A(0)=3, A(1)=1, A(2)=3.

A215828

a(n) = 7^(floor(n/3))*A(n), where A(n) = A(n-1) + A(n-2) + A(n-3)/7, with A(0)=3, A(1)=1, A(2)=3.

Terms

    a(0) =3a(1) =1a(2) =3a(3) =31a(4) =53a(5) =87a(6) =1011a(7) =1673a(8) =2771a(9) =32119a(10) =53189a(11) =88079a(12) =1020995a(13) =1690737a(14) =2799811a(15) =32454831a(16) =53744245a(17) =88998887a(18) =1031656755a(19) =1708393209a(20) =2829048851a(21) =32793751175a(22) =54305486341a(23) =89928286367

External references