Search: id:A049976 Results 1-1 of 1 results found. %I A049976 %S A049976 1,3,4,9,21,39,81,179,418,756,1515,3047,6154,12645,26387,57413,135059, %T A049976 243732,487467,974951,1949962,3900261,7801619,15607877,31235987, %U A049976 62580646,125513700,252489895,510831447,1045097262,2184472237 %N A049976 a(n)=a(1)+a(2)+...+a(n-1)+a(m), where m=2n-3-2^(p+1) and 2^p