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Number of simple 4-regular bipartite graphs with 2n nodes.
2

%I #5 Apr 03 2020 21:53:07

%S 0,0,0,1,1,4,14,130,1981,62616,2806508,158937367,10773254138,

%T 855658147832,78558952717569,8251166899386729,982806390786806618,

%U 131756175056777580011,19748565975966429686408,3289970442222058710279611,605948437043760750748781907,122796504004669690100342096563

%N Number of simple 4-regular bipartite graphs with 2n nodes.

%F Euler transform of A006824.

%Y Column k=4 of A008327.

%K nonn

%O 1,6

%A _Andrew Howroyd_, Apr 03 2020