A026075 a(n) = T(4n,n), where T is the array defined in A024996.
1, 2, 23, 230, 2395, 25518, 276298, 3026790, 33452225, 372278104, 4165976594, 46831604742, 528454140310, 5982318103300, 67908970800315, 772718361911646, 8810943692302959, 100652401936330376, 1151695085791305180, 13197378357577994370
Offset: 0