22112

Appears in sequences

• Poupard's triangle: triangle of numbers arising in enumeration of binary trees.at n=26A008301
• Poupard's triangle: triangle of numbers arising in enumeration of binary trees.at n=34A008301
• a(n) contains n digits (either '1' or '2') and is divisible by 2^n.at n=4A053312
• Number of step shifted (decimated) sequence structures using a maximum of two different symbols.at n=17A056391
• a(n) is the number of distinct (modulo geometric D3-operations) patterns which can be formed by an equilateral triangular arrangement of closely packed black and white cells satisfying the local matching rule of Pascal's triangle modulo 2, where n is the number of cells in each edge of the arrangement. The matching rule is such that any elementary top-down triangle of three neighboring cells in the arrangement contains either one or three white cells.at n=16A060553
• Lesser of two consecutive numbers each divisible by a fifth power.at n=6A068783
• Array in which the n-th row contains the multiples of n using nonzero digits and having a digit sum of n. Sequence contains the rows and a zero entry for rows with no terms (e.g. 10).at n=38A077755
• a(1) = 1, a(2) = 2, a(n) = reverse concatenation of two previous terms.at n=4A091789
• Successive generations of an alternating Kolakoski rule.at n=5A111081
• Integers corresponding to rational knots in Conway's enumeration.at n=26A122495
• Numbers n with property that for each single digit d of the base 3 expansion of n, we can also see the base 3 expansion of d^2 as a substring. Also n may not contain any 0 digits.at n=30A135464
• Numbers 3*n + 2 written in base 3.at n=76A190642
• Left half of Poupard's triangle, A008301.at n=16A210108
• Good's example of a "Standard List" of prime words over the alphabet {1,2}.at n=11A212659
• List of primitive words over the alphabet {1,2}.at n=46A213969
• List of subwords (or factors) of the Thue-Morse "1,2"-word A001285.at n=32A214215
• Triangle read by rows: T(n,k) appears in the transformation Sum_{k=0..n} (k+1)*x^k = Sum_{k=0..n} T(n,k)*(x+k)^k.at n=52A247236
• Consecutive exclusionary squares: Numbers n such that n^2 does not contain digits of n and (n+1)^2 does not contain digits of n+1.at n=51A247843
• Numbers that are divisible by the sum of their digits and for which the sum of digits equals the product of digits.at n=18A280355
• Irregular triangle read by rows: T(n,m) = number of lattice paths of type B^Q terminating at point (n, m).at n=61A291087