A014770 Squares of even pentagonal numbers.
0, 144, 484, 4900, 8464, 30976, 44100, 108900, 141376, 283024, 348100, 611524, 725904, 1166400, 1350244, 2033476, 2310400, 3312400, 3709476, 5116644, 5664400, 7573504, 8305924, 10824100, 11778624, 15023376, 16240900, 20340100
Offset: 0
Formula
a(n) = A014633(n)^2. - Sean A. Irvine, Nov 20 2018
From Chai Wah Wu, Jan 23 2020: (Start)
a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) - 6*a(n-4) + 6*a(n-5) + 4*a(n-6) - 4*a(n-7) - a(n-8) + a(n-9) for n > 8.
G.f.: -4*x*(x^7 + 168*x^6 + 227*x^5 + 1428*x^4 + 551*x^3 + 960*x^2 + 85*x + 36)/((x - 1)^5*(x + 1)^4). (End)
Extensions
More terms from Erich Friedman.
a(0)=0 inserted for consistency with A014633 by Sean A. Irvine, Nov 20 2018