Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #5 Feb 09 2024 08:43:47
%S 1,2,1,4,4,4,1,8,12,24,38,48,28,8,1,16,32,96,280,784,1952,4304,7280,
%T 8720,7136,4192,1804,560,120,16,1
%N Irregular triangle read by rows: T(n,k) is the number of connected induced k-vertex subgraphs of the hypercube graph of dimension n >= 0, 1 <= k <= 2^n.
%e Triangle begins:
%e 1;
%e 2, 1;
%e 4, 4, 4, 1;
%e 8, 12, 24, 38, 48, 28, 8, 1;
%e 16, 32, 96, 280, 784, 1952, 4304, 7280, 8720, 7136, 4192, 1804, 560, 120, 16, 1;
%e ...
%Y Cf. A290758 (row sums), A369605 (up to automorphisms of the hypercube), A369997 (up to isomorphism).
%K nonn,tabf,more
%O 0,2
%A _Pontus von Brömssen_, Feb 07 2024