212453

Properties

Appears in sequences

• Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with every one adjacent to exactly 1 other one.at n=21A153984
• Number of magic labelings with magic sum n of 2nd graph shown in link.at n=19A244870
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n), where a(0) = 2, a(1) = 4, b(0) = 1, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=19A296297
• Prime numbersat n=19007