A132479 Row sums of triangle A132478.
1, 5, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648, 4294967296, 8589934592
Offset: 0
Examples
a(3) = 32 = sum of row 3 terms of triangle A132478: (4 + 9 + 18 + 1). a(3) = 32 = 2^5.
Links
- Index entries for linear recurrences with constant coefficients, signature (2).
Formula
a(0) = 1, a(2) = 5, a(n) = 2^(n+2) for n > 1.
G.f.: -(1 + 3*x + 6*x^2)/(-1 + 2*x). - R. J. Mathar, Nov 14 2007
E.g.f.: 4*exp(2*x) - 3*(1 + x). - Stefano Spezia, Feb 20 2023
Extensions
More terms from Stefano Spezia, Feb 20 2023