42481

Appears in sequences

• Tetrahedral numbers written backwards.at n=47A004161
• The 4 X 4 Fibonacci/ anti-Fibonacci game switched modulo 2 with its dual: MA1={{0,1},{1,1}};MB1={{0,1}{1,3}}; MA2={{0,1},1,3}};MB2={{1,0},{1,1}}; the game has two characteristic polynomials: (-3 + 5 x - 3 x^3 + x^4, -1 + x + 2 x^2 - 3 x^3 + x^4}.at n=15A134035
• a(n) = n successive applications of the <*>(3,2) operator to 1.at n=12A227097