A333730 Number of simple 4-regular bipartite graphs with 2n nodes.

0, 0, 0, 1, 1, 4, 14, 130, 1981, 62616, 2806508, 158937367, 10773254138, 855658147832, 78558952717569, 8251166899386729, 982806390786806618, 131756175056777580011, 19748565975966429686408, 3289970442222058710279611, 605948437043760750748781907, 122796504004669690100342096563

Offset: 1

Author

Andrew Howroyd, Apr 03 2020

Keywords

• nonn

Crossrefs

Column k=4 of A008327.

Formula

Euler transform of A006824.