a(n) = (1/s(1) - 1/s(2) + ... + d/s(n+1)) * LCM{1, 2, ..., n}, where d = (-1)^n, s = A002944, i.e., s(k) = LCM of row k of Pascal's triangle.

A025538

a(n) = (1/s(1) - 1/s(2) + ... + d/s(n+1)) * LCM{1, 2, ..., n}, where d = (-1)^n, s = A002944, i.e., s(k) = LCM of row k of Pascal's triangle.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =9a(6) =10a(7) =66a(8) =135a(9) =395a(10) =396a(11) =4344a(12) =4345a(13) =56471a(14) =56486a(15) =56478a(16) =112957a(17) =1920251a(18) =1920252a(19) =36484768a(20) =36484789a(21) =36484767a(22) =36484768a(23) =839149640a(24) =839149645a(25) =4195748199a(26) =4195748208a(27) =12587244596a(28) =12587244597a(29) =365030093283

External references