This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
a(1) = 0 = 0_4 = 0_5 a(2) = 1 = 1_4 = 1_5 a(3) = 2 = 2_4 = 2_5 a(4) = 3 = 3_4 = 3_5 a(5) = 6 = 12_4 = 11_5 a(6) = 7 = 13_4 = 12_5 a(7) = 31 = 133_4 = 111_5 a(8) = 43 = 223_4 = 133_5 a(9) = 63 = 333_4 = 223_5 a(10) = 343 = 11113_4 = 2333_5
isnondec(v) = (#v==0) || (#select(x->(x<0), vector(#v-1, k, v[k+1]-v[k])) == 0); isok(n) = isnondec(digits(n, 4)) && isnondec(digits(n, 5)); \\ Michel Marcus, Nov 11 2019
a(1) = 0 = 0_5 = 0_6 a(2) = 1 = 1_5 = 1_6 a(3) = 2 = 2_5 = 2_6 a(4) = 3 = 3_5 = 3_6 a(5) = 4 = 4_5 = 4_6 a(6) = 7 = 12_5 = 11_6 a(7) = 8 = 13_5 = 12_6 a(8) = 9 = 14_5 = 13_6 a(9) = 14 = 24_5 = 22_6 a(10) = 43 = 133_5 = 111_6 a(11) = 44 = 134_5 = 112_6 a(12) = 64 = 224_5 = 144_6 a(13) = 93 = 333_5 = 233_6 a(14) = 94 = 334_5 = 234_6 a(15) = 784 = 11114_5 = 3344_6 a(16) = 1562 = 22222_5 = 11122_6 a(17) = 1563 = 22223_5 = 11123_6 a(18) = 1564 = 22224_5 = 11124_6 a(19) = 1569 = 22234_5 = 11133_6 a(20) = 1599 = 22344_5 = 11223_6 a(21) = 3124 = 44444_5 = 22244_6 a(22) = 9374 = 244444_5 = 111222_6
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