Binomial transform of 0, 1, 1, 7, 7, 31, 31, ..., zero followed by duplicated A083420.

A140420

Binomial transform of 0, 1, 1, 7, 7, 31, 31, ..., zero followed by duplicated A083420.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =13a(4) =45a(5) =151a(6) =483a(7) =1513a(8) =4665a(9) =14251a(10) =43263a(11) =130813a(12) =394485a(13) =1187551a(14) =3570843a(15) =10728913a(16) =32219505a(17) =96724051a(18) =290303223a(19) =871171813a(20) =2614039725a(21) =7843167751a(22) =23531600403a(23) =70598995513a(24) =211805375145a(25) =635432902651

External references