a(n) is the number of ordered ways to tile a strip of length n+2 with white tiles of odd lengths summing to length n and two red squares.

A276129

a(n) is the number of ordered ways to tile a strip of length n+2 with white tiles of odd lengths summing to length n and two red squares.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =13a(4) =27a(5) =54a(6) =106a(7) =204a(8) =387a(9) =725a(10) =1344a(11) =2469a(12) =4500a(13) =8145a(14) =14652a(15) =26213a(16) =46665a(17) =82704a(18) =145982a(19) =256722a(20) =449937a(21) =786109a(22) =1369494a(23) =2379447a(24) =4123944a(25) =7130895a(26) =12303714a(27) =21186013a(28) =36411399a(29) =62466906

External references