%I #5 Dec 29 2023 10:26:41
%S 1,2,10,74,740,9354,143144,2573586,53180944,1242078802,32358633632,
%T 930370449370,29264294868544,999646208968666,36852747307934336,
%U 1458402092927302178,61665517131334975744,2774522039432235946914
%N Main diagonal of square array A086350.
%F a(n) = ((1+sqrt(2))*(n+sqrt(2))^n-(1-sqrt(2))*(n-sqrt(2))^n)/sqrt(8).
%Y Cf. A000169, A086350.
%K easy,nonn
%O 0,2
%A _Paul Barry_, Jul 18 2003