a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2; |s(i) - s(i-1)| <= 1 for i >= 3, s(n) = 3. Also a(n) = T(n,n-3), where T is the array defined in A024996.
A026070
a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2; |s(i) - s(i-1)| <= 1 for i >= 3, s(n) = 3. Also a(n) = T(n,n-3), where T is the array defined in A024996.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =24a(4) =76a(5) =232a(6) =707a(7) =2136a(8) =6429a(9) =19282a(10) =57695a(11) =172316a(12) =513955a(13) =1531362a(14) =4559271a(15) =13566288a(16) =40349619a(17) =119972214a(18) =356634978a(19) =1059985776a(20) =3150165270a(21) =9361450868a(22) =27819215185a(23) =82670528056a(24) =245680350995a(25) =730149455646
External references
- oeis: A026070