57721023502domain: NAppears in sequencesa(n) = 12*a(n-1) - a(n-2), with a(0) = 2 and a(1) = 12.at n=10A087800Sequences A087800 and A077416 interleaved.at n=20A164826a(n) = 2 * T(n,(n+2)/2) where T(n,x) is a Chebyshev polynomial of the first kind.at n=10A343261