cp's OEIS Frontend

A305401 Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) is Sum_{j=0..floor(n/2)} ((n-j)!/j!)*binomial(n-j,j)*k^(n-2*j).

%I A305401 #35 Jun 02 2018 13:06:02
%S A305401 1,1,0,1,1,1,1,2,3,0,1,3,9,10,1,1,4,19,56,43,0,1,5,33,174,457,225,1,1,
%T A305401 6,51,400,2107,4626,1393,0,1,7,73,770,6433,31779,55969,9976,1,1,8,99,
%U A305401 1320,15451,129060,574129,788192,81201,0,1,9,129,2086,31753,387045,3103873,12088488,12667041,740785,1
%N A305401 Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) is Sum_{j=0..floor(n/2)} ((n-j)!/j!)*binomial(n-j,j)*k^(n-2*j).
%H A305401 Seiichi Manyama, <a href="/A305401/b305401.txt">Antidiagonals n = 0..139, flattened</a>
%F A305401 A(n,k) = k*n*A(n-1,k) + A(n-2,k) for n>1.
%e A305401 Square array begins:
%e A305401    1,  1,   1,    1,    1,     1, ...
%e A305401    0,  1,   2,    3,    4,     5, ...
%e A305401    1,  3,   9,   19,   33,    51, ...
%e A305401    0, 10,  56,  174,  400,   770, ...
%e A305401    1, 43, 457, 2107, 6433, 15451, ...
%Y A305401 Columns k=0-3 give A059841, A001040(n+1), A036243, A305459.
%Y A305401 Rows n=0-2 give A000012, A001477, A058331.
%Y A305401 Main diagonal gives A305465.
%Y A305401 Cf. A305466.
%K A305401 nonn,tabl
%O A305401 0,8
%A A305401 _Seiichi Manyama_, Jun 02 2018