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

A183885

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

Terms

    a(0) =1a(1) =121a(2) =631a(3) =2059a(4) =6399a(5) =19483a(6) =58807a(7) =176859a(8) =531103a(9) =1593931a(10) =4782519a(11) =14348395a(12) =43046143a(13) =129139515a(14) =387419767a(15) =1162260667a(16) =3486783519a(17) =10460352235a(18) =31381058551a(19) =94143177675a(20) =282429535231a(21) =847288608091

External references