Number of arrangements of n+2 numbers in 0..2 with each number being the sum mod 3 of two others.

A183877

Number of arrangements of n+2 numbers in 0..2 with each number being the sum mod 3 of two others.

Terms

    a(0) =1a(1) =31a(2) =171a(3) =631a(4) =2059a(5) =6399a(6) =19483a(7) =58807a(8) =176859a(9) =531103a(10) =1593931a(11) =4782519a(12) =14348395a(13) =43046143a(14) =129139515a(15) =387419767a(16) =1162260667a(17) =3486783519a(18) =10460352235a(19) =31381058551a(20) =94143177675a(21) =282429535231a(22) =847288608091

External references