Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 2^(n-1) * binomial(n-2, k-1) otherwise.

A146986

Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 2^(n-1) * binomial(n-2, k-1) otherwise.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =7a(8) =7a(9) =1a(10) =1a(11) =12a(12) =22a(13) =12a(14) =1a(15) =1a(16) =21a(17) =58a(18) =58a(19) =21a(20) =1a(21) =1a(22) =38a(23) =143a(24) =212a(25) =143a(26) =38a(27) =1a(28) =1a(29) =71

External references