A381777 Self-convolution of A001190.
0, 0, 1, 2, 3, 6, 11, 22, 44, 92, 193, 414, 896, 1966, 4347, 9700, 21787, 49262, 111976, 255824, 586996, 765220, 1187129, 2186146, 3966763, 7642844, 14733649, 29037924, 57062745, 113051998, 222948526, 438614648, 853410655, 1637949306, 3069032471, 5548974602, 9438433065
Offset: 0
Links
- David Serena and William J. Buchanan, Equivalence Classes Induced by Binary Tree Isomorphism -- Generating Functions, arXiv:2503.02663 [math.CO], 2025. See p. 5.
Crossrefs
Cf. A001190.
Programs
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Mathematica
terms = 20; A[] = 0; Do[A[x] = x + (1/2)*(A[x]^2 + A[x^2]) + O[x]^terms // Normal, terms]; CoefficientList[A[x]^2, x] (* after Jean-François Alcover, Jan 10 2018 *)