A005892: Truncated square numbers?

[Zakir Seidov]

Dear seqfans,
I didn't find anywhere
the definition (description) of Truncated Square Number
(even Goooogle fails)
except this:

%I A005892 %S A005892
1,12,37,76,129,196,277,372,481,604,741,892,1057,1236,1429,1636,1857
%N A005892 Truncated square numbers: 7*n^2 + 4*n + 1.
%D A005892 B. K. Teo and N. J. A. Sloane, Magic numbers in polygonal
and polyhedral clusters, Inorgan. Chem. 24 (1985), 4545-4558.

Could anyone please illuminate,
thanks, Zak