Number of compositions of 7*n-2 into parts 1 and 7.

Terms

a(0) =1a(1) =7a(2) =35a(3) =168a(4) =819a(5) =4025a(6) =19796a(7) =97315a(8) =478304a(9) =2350860a(10) =11554621a(11) =56791883a(12) =279136551a(13) =1371977475a(14) =6743373646a(15) =33144194898a(16) =162906243014a(17) =800696596250