Numerator of the product of the n-th triangular number and the n-th harmonic number.

Terms

a(0) =1a(1) =9a(2) =11a(3) =125a(4) =137a(5) =1029a(6) =363a(7) =6849a(8) =7129a(9) =81191a(10) =83711a(11) =1118273a(12) =1145993a(13) =1171733a(14) =1195757a(15) =41421503a(16) =42142223a(17) =813635157a(18) =275295799a(19) =279175675a(20) =56574159a(21) =439143531a(22) =1332950097a(23) =33695573875a(24) =34052522467a(25) =309561680403a(26) =312536252003