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%I #6 Jan 26 2023 10:14:19
%S 1,18,255,3465,47880,687960,10372320,164656800,2754259200,48518870400,
%T 899026128000,17495593315200,356995102464000,7625049239808000,
%U 170196434343936000,3963602854987776000,96160451873181696000
%N Unsigned fourth column (k=3) of triangle A136656 divided by 8.
%C Also unsigned third column of triangle A136657 divided by 4.
%D Ch. A. Charalambides, Enumerative Combinatorics, Chapman & Hall/CRC, Boca Raton, Florida, 2002, Table 8.3, p. 311, with s=-2, k=3 column/8.
%F a(n) = |A136656(n+3,3)|/8, n>=0.
%F E.g.f.: (2+18*x+3*x^2-12*x^3+3*x^4)/(2*(1-x)^9) (derived from the one given for the column k=3 under A136656).
%Y Cf. A136656, A136659 (column k=2), A136661 (column k=4).
%K nonn,easy
%O 0,2
%A _Wolfdieter Lang_, Feb 22 2008